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Phosphates in archaeology
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History of use in archaeology
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Accuracy and validity of the methodology
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Performing a phosphate analysis survey
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Interpretive possibilities
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Summary

Sources

Anderson, C., 1999.  Phosphate Cycling in Energy Crops with Emphasis on the Return of Ash to the Growing Cycle. Unpublished MS in Environmental Science, Trinity College: Dublin.

Arrenius, O., 1929. Die phosphatamethode I & II. Zeitschrift für Pflanzenernährung. Düngung und Bodenkunde, Teil A 14:120-140, 185-194.

Barker, H., M.J. Hughes, W.A. Oddy, A.E. Werner, 1975.  Report on phosphate analysis carried out in connection with the Cenotaph problem. In The Sutton-Hoo Ship Burial Volume I, edited by R.L.S. Bruce-Mitford: 550-572.

Bending, G., C. Putland and F. Ryans, 2000.  Changes in Microbial Community Metabolism and Labile Organic Matter Fractions as Early Indicators of the Impact of Management on Soil Biological Quality. Biological Fertility of Soils 31: 78-84.

Bethell P. and I. Máté, 1989. The Use of Soil Phosphate Analysis in Archaeology; A critique. In Scientific Analysis in Archaeology and its Interpretation, edited by J. Henderson: 1-29. U.C.L.A. Institute of Archaeology: Los Angeles.

Biek, L., 1957. The Great Barrow at Bishop’s Waltham, Hampshire, edited by P. Ashbee. Proceedings of the Prehistorical Society 23: 137-166.

Bjelajac, V., E. Lubby and R. Ray, 1996. A Validation Test of a Field-based Phosphate Analysis Technique. Journal of Archaeological Science 23(2): 243-248.

Bolan, N.S., N.J. Barrow and A.M. Posner, 1985. Describing the Effect of Time on Sorption of Phosphate by Iron and Aluminium Hydroxides. Journal of Soil Science 36: 187-197.

Bordovsky, D., M. Choudhary and C. Gerard, 1999.  Effect of Tillage, Cropping and Management on Soil Properties in the Texas Rolling Plains. Soil Society 164: 331-340.

Brady, N.C., 1974. The Nature and Properties of Soils. 8th ed. Macmillan Publishing Co., Inc.: New York.

Branigan, T.D., 1977. Phosphate Sorption and Desorption Characteristics of Irish Soils and their Relationships with other Soil Properties. Unpublished M Agr. Sci., University College Dublin: Dublin .

Bray, R.H. and L.T. Kurtz, 1945.  Determination of Total, Organic, and Available Forms of Phosphorus in Soils. Soil Science 59: 39-45.

Bridges, E., 1997. World Soils, Third Edition. Cambridge University Press: Cambridge.

Buehler, S., A. Oberson, I.M. Rao, D.K. Erieson and E. Frossard, 2002. Sequential Phosphorus Extraction of a 33P- labeled Oxisol under Constraining Agricultural Systems. Soil Science Society of American Journal 66: 868-877.

Canti, M., 2001. What is Geoarchaeology? Re-examining the Relationship between Archaeology and Earth Science. In Environmental Archaeology: Meaning and Purpose, edited by U. Albarella: 103-108.  Kluwer Academic Press: Amsterdam.

Cavanagh, W.G., S. Hirst and C.D. Litton, 1988. Soil Phosphate, Site Boundaries, and Change Point Analysis. Journal of Field Archaeology 15: 67-83.

Chaya, H.J., 1996. Studies of Soils from an Aleutian Island Site. In Archaeological Chemistry: Organic, Inorganic, and Biochemical Analysis, edited by M.V. Orna: 131-138. American Chemical Society Symposium Series 625: Washington D.C..

Chinault, S.L. and G.A. O’Connor, 2008. Phosphorus Release from a Biosolids Amended Sands Spodosol. Journal of Environmental Quality 37: 937-943.

Church, M.J., C. Peters and C.M. Batt, 2007. Sourcing Fire Ash on Archaeological Sites in the Western and Northern Isles of Scotland, Using Mineral Magnetism. Geoarchaeology 22(7): 747-771.

Conway, J.S., 1983. An Investigation of Soil Phosphorus Distribution within Occupation Deposits from a Romano-British Hut Group. Journal of Archaeological Science 10: 117-128.

Cook, S. F. , and R. F. Heizer, 1965.  Studies on the Chemical Analysis of Archaeological Sites. University of California Publications in Anthropology 2.

Courty, M., P., Goldberg and R. Macphail, 1989. Soils and Micromorphology in Archaeology. Cambridge University Press: Cambridge.

Craddock, P., D. Gurney, F. Pryor and M. Hughes, 1985. The Application of Phosphate Analysis on the Location and Interpretation of Archaeological Sites. The Archaeological Journal, The Royal Archaeological Institute 142: 361-376.

Crowther, J.,
1996. Phosphate Migration Around Buried Bone. In The Experimental Earthwork Project 1960-1992 (CBA Report 100), edited by M.G. Bell, P.J. Fowler and S.W. Hilson: 195-198. Council for British Archaeology Research: London.
1997. Soil Phosphate Surveys: critical approaches to sampling, analysis and interpretation. Archaeological Prospection 4(2):  93-102.
1998. Laboratory Reports on Soil Samples. In Llawhaden, Dyfend: excavations on a group of small defended enclosures, 1980-4, edited by K. Blockley: 118-120. BAR British Series 275. Archaeopress: Oxford.

Daly, K. and D. Styles, 2000. Eutrophication from Agricultural Sources Phosphorus Chemistry of Mineral and Peat Soils. Environmental Research Technical Development and Innovation Programme 2000-2006, prepared for the Environmental protection Agency. Teagasc: Wexford.

Dauncy, K.D.M.,1952. Phosphate Content of Soils on Archaeological Sites. Advancement of Science 9: 33-37.

Delgado, A. and R. Scalenghe, 2008. Aspects of Phosphorus Transfer from Soils in Europe. Journal of Plant Nutrition and Soil Science 171(4): 552-575.

Demaria, P., R. Flisch, E. Frossard and S. Sinaj, 1990. Exchangeability of Phosphate Extracted by 4 Chemical Methods. Journal of Plant Nutrition and Soil Sciences 168: 89-93.

Dick, W.A. and M.A. Tabatabai, 1977. An Alkaline Oxidation Method for Determination of Total Phosphorus in Soils. Soil Science Society of America Journal 41: 511-514.

Dietz, E.F., 1957. Phosphate Accumulation in Soil of an Indian Habitation Site. American Antiquity 22: 405-409.

Eidt, R.C.,
1973. A Rapid Chemical Field Test for Archaeological Site Surveying. American Antiquity 38: 206-210.
1984. Advances in Abandoned Settlement Analysis: application to prehistoric antrosols in Columbia, South America. University of Wisconsin-Milwaukee, Center for Latin America: Milwaukee, Wisconsin.

Eidt, R. C. and W. I. Woods, 1974. Abandoned Settlement Analysis Theory and Practice. Field Test Association: Wisconsin.

Entwistle, J.A., K.J.W. McCaffrey and R.A. Dodgshon, 2007. Geostatistical and Multi Elemental Analysis of Soils to Interpret Land-Use History in the Hebrides, Scotland. Geoarchaeology 22(4): 391-412.

French, C.A.I. and T. M. Whitelaw, 1999.  Soil Erosion, Agricultural Terracing and Site Formation Processes at Markiani, Amorgos, Greece: The Micromorphological Prospective. Geoarchaeology 14(2): 151-189.

Freterrigo, J., M. Turner, S. Pearson and P. Dixon, 2005.  Effects of Past Land-use on Spatial Heterogeneity of Soil Nutrients in Southern Appalachian Forests. Ecological Monograph 75(2): 215-228.

Forster, J.C., 1995. Soil Phosphorus. In Methods in Applied Soil Microbiology and Biochemistry, edited by K. Alef and P. Nannipieri: 88-93. Academic Press: London.

Gill, R., 1996. Chemical Fundamentals of Geology. Chapman & Hall: London

Gebhardt, A. and R. Langohr, 1999. Micromorphological Study of Construction Materials  and Living Floors in the Medieval Motte of Werken (West Flanders, Belgium). Geoarchaeology 14(7): 595-620.

Gladfelter, B.G., 1981. Developments and Directions in Geoarchaeology. In Advances in Archaeological Method and Theory, edited by M.B. Schiffer: 343–364.  Academic Press: New York.

Goldberg, P. and S. Sherwood, 2006. Deciphering Human Prehistory through the Geoarchaeological Study of Cave Sediments. Evolutionary Anthropology 15(1): 20-36.

Goffer, Z., 1980. Archaeological Chemistry: a sourcebook on the applications of chemistry to archaeology. John Wiley and Sons: New York.

Gurney, D.A., 1985.  Phosphate Analysis of Soils: a guide for the field archaeologist. The Institute of Field Archaeologist: Birmingham.

Hamond, F.W., 1983. Phosphate Analysis of Archaeological Sediments. In Landscape Archaeology in Ireland, edited by T. Reeves-Smyth and F. W. Hamond: 47-81. BAR British Series 116, British Archaeological Review: Oxford.

Haslam, R. and M. Tibbett, 2004.  Sampling and Analyzing Metals in Soils for Archaeological Prospection: a Critique. Geoarchaeology 19(8): 731-743.

Haynes R.J. and R.W. Swift,
1985. Effects of Liming and Air-drying on the Adsorption of Phosphate by some Acid Soils. Journal of Soil Science 36: 513-521.
1989. The Effects of pH and Drying on Adsorption of Phosphate by Aluminium-organic Matter Associations. Journal of Soil Sciences 40: 773-781.

Hedley, M.J., J.W.B. Stewart and B.S. Chauhan, 1982. Changes in Inorganic and Organic Phosphorus Fractions induced by Cultivation Practices and by Laboratory Incubations. Soil Science Society of America Journal 46: 970-976.

Heidenreich, C.E., A.R. Hill, D.M. Lapp and S. Navratil, 1971.  Soil and Environmental Analysis at the Robitaille Site. In Palaeoecology and Ontario Archaeology – II, edited by W.M. Hurley and C.E. Heidenreich: 179-237. University of Toronto, Department of Anthropology: Toronto.

Hjulström, B. and S. Isaksson, 2009.  Identification of Activity Area Signatures in a Reconstructed Iron Age House by Combining Element and Lipid Analysis of Sediments. Journal of Archaeological Science 36: 174-183.

Holliday, V. T. and W. G. Gartner, 2007. Methods of Soil P Analysis in Archaeology. Journal of Archaeological Science 34(2): 301-333.

Homsey, L.K. and R.C. Capo, 2006.  Integrating Geochemistry and Micromorphology to Interpret Feature Use at Dust Cave, a Paleo-Indian through Middle Archaic Site in Northwest Alabama. Geoarchaeology 21(3): 237-269.

Hutson, S. and R. Terry, 2006.  Recovering Social and Cultural Dynamics from Plaster Floors: Chemical Analysis at Ancient Chunchucmil, Yucatan, Mexico. Journal of Archaeological Science 33: 391-404.

James, P., 1999. Soil Variability in the Area of an Archaeological Site near Sparta, Greece. Journal of Archaeological Science 26(10): 1273-1288.

Johnson, A. H., 1956. Examinations of Soil from Ceremony chambered cairn. Proceedings of the Society of Antiquities of Scotland 88 (1954-6): 200-207.

Karakanas, P., N. Kyparissi-Apostilka and O. Bar-Yosef, 1999.  Mineral Assemblages in Theopetra, Greece: a framework to understanding diagenensis in a prehistoric cave. Journal of Archaeological Science 26(9): 1171-1180.

Keeley, H.C.M., 1981. Recent Work using Soil Phosphorus Analysis in Archaeological Prospection. Revue d’Archéométrie 5: 89-95.

Kent, S.,
1990a. Activity Areas and Architecture: an interdisciplinary view of the relationships between use-of-space and domestic built environments. In New Directions in Archaeology Domestic Architecture and the Use-of-Space an interdisciplinary cross-cultural study, edited by S. Kent: 1-8. Cambridge University Press: Cambridge.
1990b. A Cross-Cultural Study of Segmentation, Architecture and the Use-of-Space. In New Directions in Archaeology Domestic Architecture and the Use-of-Space an interdisciplinary cross-cultural study, edited by S. Kent: 127-152. Cambridge University Press: Cambridge.

Kerr, J., 1995. Phosphate Imprinting Within Mound A at the Huntsville Site. In Pedological Perspectives in Archaeological Research, edited by M.E. Collins, B.J. Carter, B.G. Gladfelter and R.J. Southard: 133-150. Soil Science Society of America: Madison, Wisconsin.

Konrad, V.A., 1973.  The effects of past human habitation on the soils of 2 Huron Villages. MA Thesis, Department of Geography, University of York: York, England.

Kuo, S., 1996. Phosphorus. In Methods of Soil Analysis, Part 3 – Chemical Methods, edited by D.L. Sparks, A.L. Page, P.A. Helmke, R.H. Loeppert, P.N. Soltanpour, M.A. Tabatabai. C.B. Johnston and M.E. Summers: 869-919. Soil Science Society of America Book Series 5: Madison, Wisconsin.


LeMare, P.H. and L.A. Leon, 1989. The Effects of Lime on Adsorption and Desorption of Phosphate in 5 Columbian Soils. Journal of Soil Science 40: 59-69.
Lillios, K.T., 1992. Phosphate Fractionations of Soils at Agroal, Portugal. American Antiquity 57: 495-506.

Linderholm, J., 2007. Soil Chemical Surveying: a path to a deeper understanding of prehistoric sites and societies in Sweden. Geoarchaeology 22(4): 417-436.

Linderholm J. and E. Lundberg, 1994. Chemical Characterization of Various Archaeological Soil Samples using Main and Trace Elements Determined by Inductively Coupled Plasma Emission spectrometry. Journal of Archaeological Science 21: 303-314.

Lippi, R., 1988. Paleotopography and Phosphate Analysis of a Buried Jungle Site in Ecuador. In Journal of Field Archaeology 15: 85-97.

Litton, C.D. and C.E. Buck, 1995.  The Bayesian Approach to the Interpretation of Archaeological Data. Archaeometry 37(1): 1-24.

Lorch, W., 1940. Die siedlungsgeographische phosphatmethode. Die Naturwissenschaften 28: 633-640.

Macphail, R.I., G.M. Cruise, M.J. Allen, J. Linderholm and P. Reynolds, 2004. Archaeological Soil and Pollen Analysis of Experimental Floor Deposits; with specific reference to Butser Ancient Farm, Hampshire, UK. Journal of Archaeological Science 31: 175- 191.

Matheron, G., 1963.  Principles of Geostatistics. Economic Geology 58: 1246-1266.

Matthews, W., C.A.I. French, T. Lawrence, D.F. Cutler and M.K. Jones, 1997. Microstratigraphic Traces of Site Formation Processes and Human Activities. World Archaeology 29 (2): 281-308.

Matthews, W., J. Wiles and M. Almond, 2006. Micromorphology and Microanalysis of Architectural Surface Materials and Residues: investigation of source materials and the life-cycle of buildings. Çhatalhöyük Archive Report: 285-294.

McDowell, P.F., 1988. Chemical Enrichment of Soils at Archaeological Sites: some Oregon case studies. Physical Geology 9: 247-262.

McKeague, J.A., F. DeConinck and D.P. Franzmeier. 1983.  Spodosols. In Pedogenesis and Soil Taxonomy II. The Soil Orders, Developments in Soil Science 11B,edited by L.P. Wilding, N.E. Smeck and G.F. Hall: 217-252. Elsevier: Oxford.

Mehlich, A., 1984. Mehlich 3 Soil Test Extractant: a modification of Mehlich 2 extractant. Communications in Soil Science and Plant Analysis 15: 1409-1416.

Merrits, D., A. DeWet and K. Menking, 1998.  Environmental Geology. W.H. Freeman and Co.: New York.

Middleton, W.D., 2004. Identifying Chemical Activity Residues on Prehistoric House Floors: a Methodology and Rationale for Multi-Elemental Characterization of a Mild Acid Extract of Anthropogenic Sediments. Archaeometry 46(1): 47- 65.

Middleton, W.D. and T.D. Price. 1996.  Identification of Activity Areas by Multi-element Characterization of Sediments from Modern and Archaeological House Floors Using Inductively Coupled Plasma-atomic Emission Spectroscopy. Journal of Archaeological Science 23: 673- 687.

Milek, K., 2005. Interpreting the Viking Age to Medieval Period Transition in Norse Orkney Through Cultural Soil and Sediment Analysis. Geoarchaeology 20(4): 355-357.

Morgan, M.F., 1941. Chemical Soil Diagnosis by the Universal Testing System. Connecticut Agricultural Experiment Station Bulletin 450: New Haven.

Murphy, J. and J.P. Reily. 1962. A Modified Single Solution Method for Determination of Phosphate in Natural Waters. Anal. Chim. Acta 27: 31-36.

Olsen, S.R. and L.E. Sommers, 1982. Phosphorus. In Methods of Soil Analysis: part 2 chemical and microbiological properties, edited by A.L. Page: 403-430. American Society of Agronomy Mongr. 9 2nded. ADA and SSSA: Madison, Wisconsin.

Oonk, S., C. Slomp, D. Huisman and S. Vriend, 2009. Effects of Site Lithology on Geochemical Signatures of Human Occupation in Archaeological House Plans in the Netherlands.  Journal of Archaeological Science 36(6): 1215-1228.

Orser, C., 1996. Can There Be an Archaeology of the Great Famine? In ‘Fearful Realities’: New Perspectives on the Famine, edited by C. Morash and R. Hayes: 77-90. Irish Academic Press: Dublin.

Overstreet, D.F., 1974. A Rapid Chemical Field Test for Archaeological Surveying: an application and evaluation. The Wisconsin Archaeologist 55: 257-259.

Parnell, J.J., R.E. Terry and P. Sheets, 2002. Soil Chemical Analysis of Ancient Activities in Cerén, El Salvador: A Case Study of a Rapidly Abandoned Site. Latin American Antiquity 13(3): 331-342.

Persson, K.B., 1997.  Soil Phosphate Analysis: a new technique for measurement in the field using a test strip.  Archaeometry 39(2): 431-439.

Prøsch-Danielsen, L. and A. Somonsen, 1988.  Principle Components Analysis of Pollen, Charcoal and Soil Phosphate data as a tool in Prehistoric Land-use Investigation at Forsandmoen, Southwest Norway. Norwegian Archaeological Review 21(2): 85-102.

Proudfoot, B., 1976. The Analysis and Interpretation of Soil Phosphorus in Archaeological Contexts. In Geoarchaeology, Earth Science and the Past, edited by D.A. Davidson and M.L. Shakley: 93-113. Duckworth: London.

Sanchez-Viscasno, A. and M. L. Caabate, 1999.  Identification of Activity Areas by Soil Phosphorus and Organic Matter Analysis in a 4th century BC Iberian Sanctuary “Cerro El Pajarillo.” Geoarchaeology 14(1): 47-62.

Sanders, D., 1990. Behavioral Conventions and Archaeology: methods for the analysis of ancient architecture. In New Directions in Archaeology Domestic Architecture and the Use-of-Space an interdisciplinary cross-cultural study, edited by S. Kent: 43-72. Cambridge University Press: Cambridge.

Sandor, J. A., 1992.  Long Term Effects of Prehistoric Agriculture on Soils: examples from New Mexico and Peru. In Soils in Archaeology: Landscape, Evolution and Human Occupation, edited by V. T. Holliday: 217-230. Smithsonian Institute Press: Washington and New York.

Schiffer, M.B., 1996. Formation Processes of the Archaeological Record. University of Utah Press: Salt Lake City, Utah.

Schuldenrein, J.,
1995. Geochemistry, Phosphate Fractionation, and the Detection of Activity Areas at Prehistoric North American Sites. In Pedological Perspectives in Archaeological Research, edited by M.E. Collins, B.J. Carter, B.G. Gladfelter and R.J. Southard: 107-132. Soil Science Society of America: Madison. Wisconsin.
2001. Stratigraphy, Sedementology and Site Formation at Konispol Cave, Southwest Albania. Geoarchaeology 16(5): 559-602.

Schwartz, G.T., 1967. A Simplified Chemical Test for Archaeological Field Work. Archaeometry 10: 57-63.

Scudder, S., 1996.  Human Influences on Pedogenesis Midden Soils on a Southwest Florida Pleistocene Island. In Case Studies in Environmental Archaeology, edited by E. J. Reitz, L. A. Newsome and S. J. Scudder: 55-67. Plenum Press: New York.

Sieveking, G., I.H. Longworth, M.J. Hughes, A.J. Clark and A. Millet, 1973.  A New Survey of Grime’s Graves- first report. Proceedings of the Prehistorical Society 39: 182-218.

Simpson, I., P. van Bergen, V. Perret, M. Elhmmali, D. Roberts and R. Evershed, 1999. Lipid Biomarkers of Manuring Practice in Relict Anthropogenic Soils. The Holocene 9(2): 223-229.

Sjoberg, A., 1976.  Phosphate Analysis of Anthropic Soils. Journal of Field Archaeology 3: 447-454.

Smith, H., P. Marshal and M. P. Pearson, 2001.  Reconstructing House Activity Areas. In Environmental Archaeology: Meaning and Purpose, edited by U. Albarella: 249-263.  Kluwer Academic Press: Amsterdam.

Smyth, M.P., C.D. Dore and N.P. Dunning, 1995.  Interpreting Prehistoric Settlement Patterns: lessons from the Maya center of Sayil Yucatan. Journal of Field Archaeology 22(3): 321-342.

Stein, J. K., 1992. Organic Matter in Archaeological Contexts. In Soils in Archaeology: Landscape, Evolution and Human Occupation, edited by V. T. Holliday: 193-208. Smithsonian Institute Press: Washington D.C..

Solecki, R.S., 1951. Notes on Soil Analysis and Archaeology. American Antiquity 16: 254- 256.

Terry, R. E., F. G. Fernández, J. J. Parnell and T. Inomata, 2004.  The Story in the Floors: Chemical Signatures of Ancient and Modern Mayan Activities at Aguateca, Guatemala. Journal of Archaeological Science 31: 1237-1250.

Terry, R. E., S. D. Nelson, J. Carr, J. Parnell, P. J. Hardin, M. W. Jackson and S. D. Houston, 2000.  Quantitative Phosphorus Measurement: a field test procedure for archaeological site analysis at Piedras Wegras, Guatemala. Geoarchaeology 15(2): 151-166.

Truog, E., 1930. Determination of the Readily Available Phosphorus in Soils. Journal of the American Society of Agronomy 22: 874-882.

Ullrich, J.,
2007.  Practical Applications of Phosphate Analysis in Household and Abandoned Settlement Archaeology: case studies from Ireland and New York State. MA Thesis, Faculty of the Graduate School, Cornell University: Ithaca, New York.
2010. Geochemical Contributions to the Archaeological Examination of Promontory Forts: phosphate analysis  on Achillbeg and Achill Islands, Co. Mayo. PhD Thesis, School of Archaeology, College of Arts and Celtic Studies, University College Dublin: Dublin, Ireland.

Wells, E. C., 2004. Investigating Activity Patterns in Prehispanic Plazas: Weak Acid Extraction ICP-AES Analysis of Anthrosols at Classic Period El Coyote, Northwestern Honduras. Archaeometry 46(1): 67-84.

Wells, E.C., R.E. Terry, J.J. Parnell, P.J. Hardin, M.W. Jackson and S.D. Houston, 2000. Chemical Analysis of Ancient Anthrosols in Residential Areas at Piedras Negras Guatemala. Journal of Archaeological Science 27: 449-462.

Weston, D., 1995.  A Magnetic Susceptibility and Phosphate Analysis of a Longhouse Feature on Caer Cadwgan, near Cellan, Lampeter, Wales. Archaeological Prospection 2:19-27.

Wilk, R., 1990. The Built Environment and Consumer Decisions. In New Directions in Archaeology Domestic Architecture and the Use-of-Space an interdisciplinary cross-cultural study, edited by S. Kent: 34-42. Cambridge University Press: Cambridge.

Wilson, C., D. Davidson and M. Cresser,  
2005.  An Evaluation of Multi-element Analysis of Historic Soil Contamination to Differentiate Space Use and Former Function in and around Abandoned Farms. The Holocene 15(7): 1094-1099.
2008. Multi-element Analysis: an Assessment of its Potential as an aid to Archaeological Interpretation. Journal of Archaeological Science 35(2): 412-424.

Yang, C and L. Yang, 2006.  Organic Phosphorus Fractions in  Organically Amended Paddy Soils in Continuously and Intermittently Flooded Conditions. Journal of Environmental Quality 35: 1142-1150.

Yerkes, R. W., A. Sarris, T. Frolking, W. A. Parkinson, A. Gyucha, M. Hardy and L. Catanoso, 2007.  Geophysical and Geochemical Investigations at Two Early Copper Age Settlements in the Körös River Valley, Southeastern Hungary. Geoarchaeology 22(8): 845-868 .

Zibilske, L.M. and J.M. Bradford, 2003.  Tillage Effects on Phosphorus Mineralization and Microbial Activity. Soil Science 168(10): 677-685.

Zhen, Z., R. Simard, J. Lafond and L. Parent, 2002. Pathways of Soil Phosphorus Transformations after 8 years of Cultivation under Contrasting Cropping Practices. Soil Science Society of America Journal 66(3): 999-1007.

Johanna Ullrich, Ph.D.