News & Comment NEWS & NOTES + See all authors and affiliations Science 26 May 1972:Vol. 176, Issue 4037, pp. 896DOI: 10.1126/science.176.4037.896 Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears below.
Science Vol 176, Issue 403726 May 1972 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)
