Letters Response By RICHARD E. W. ADAMS See allHide authors and affiliations Science 01 Feb 1991:Vol. 251, Issue 4993, pp. 498-499DOI: 10.1126/science.251.4993.498-c RICHARD E. W. ADAMS Center for Archaeological Research, and Director, Rio Azul Archaeological Project, University of Texas, San Antonio, TX 78285Find this author on Google Scholar Find this author on PubMed Search for this author on this site Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears above.
Science Vol 251, Issue 499301 February 1991 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)