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Research by
geographic area:

Peru
Mexico
China
US and Other
Europe
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Research by geographic area: China
(since 1990; please see C.V. for full details.)

Articles and Chapters     
(includes selected recent refereed abstracts):

• 2002 The role of occlusal stress and gingival infection in the formation of exostosis on mandible and maxilla from Neolithic China (2nd author with Ekaterina Pechenkina), Homo 53:112-150.
  
  
• 2001 Diet and Health Changes with the Intensification of Millet Agriculture at the End of the Chinese Neolithic (second author with Ekaterina A. Pechenkina and Wang Zhijun), American Journal of Physical Anthropology 116:15-36.
  
  
• 1999 Phytolith Morphology (third author with DR Piperno, DM Pearsall, L Kealhofer, Zhijun Zhao, and Q. Jiang), Science (Letter) 283:1265-1266.
  
  
• 1998 Distinguishing Rice (Orza sativa Poaceae) from Wild Orza Species Through Phytolith Analysis, II: Finalized Method. Zhao, Zhijun, Deborah M. Pearsall, Robert A. Benfer, Jr., and Dolores R. Piperno, Economic Botany 52:134-145.
  
  
• 1995 Multiple Linear Discriminant Function, Multidimensional Scaling, and Individual Pathways for Developing Knowledge Based Systems, pp. 464-466 in Proceedings of PACES '95, Ed. by Fan-Lun Xiong, Jae Kyu Lee, and Riichiro Mizoguchi, Publishing House of Electronics Industry, Beijing, China.
  
  
• 1995 Identifying Rice (Orza sativa), Poaceae, through Phytolith Analysis (junior author with Deborah M. Pearsall, Dolores R. Piperno, Elizabeth H. Dinan, Marcelle Umlauf, and Zhijun Zhao), The Journal of Economic Botany 19:185-196.
  
  
• 1992 The Value of Expert Systems in Improving Agricultural Production in China, the Institute of Intelligent Machines, Academica Sinica, Heifei, P.R. China. REPORT.

Field Work      

• May-June, 1999 Northern Chinese Neolithic Project, Xi'an, China.
  
  
• July-August 1998 Neolithic of Northeast China Project,, study in Xi'an and Beijing.
• July-August 1992, Huangshan, China Expert systems agricultural applications in China.
  

Research Support     

• 2002 Dietary Adjustments and Demographic Responses to environmental deterioration during the 4th millennium BC in China (Co-CPI with Ekaterina Pechenkina), NSF, pending.
  
  
• 1998 The Neolithic of Northeastern China: Skeletal Evidence for the Early Adoption of Agriculture, University of Missouri Research Board, $29,820.
  
  
• 1998 Neolithic of Northeast China Project: Preliminary study of materials from the Xi'an region, University of Missouri Research Council award, $ 4,060.
  
  
• 1995 Academica Sinica, P.R. China. International Travel support to attend and co-chair a session PACES'95, Huangshan, P.R. China, May 1995, invited paper. $1000.
  
  
• 1994 Collaborative Basic Research Towards the Development and Maturation of Phytolith Analysis in Archaeology (Deborah Pearsall, Robert A. Benfer, Jr., and Dolores R. Piperno), NSF (Archaeometry), Supplemental grant, $8,125.
  
  
• 1992 Reconnaissance in Huangshan Province, China, feasibility study for future work in application of expert systems to improving agriculture; travel. China Center for Economic Development and The Institute of Intelligent Machines, Academica Sinica, $3200.