1. Department of Geography, Texas Tech University, Lubbock 79409.
2. Department of Anthropology, University of California, Santa Barbara 93106.
3. Crocker Nuclear Laboratory, University of California, Davis 95616.
4. U.S. Geological Survey, Menlo Park, CA 94025.
5. NSF Regional Facility for Radioisotope Analysis, University of Arizona, Tucson 85721.
6. Applied Conservation Technology, 14340 Bolsa Chica Avenue, Suite E, Westminster, CA 92683.
7. Institute of Archaeology, University of California, Los Angeles 90024.
8. IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598.