Departments Instructions for Contributors Science 30 Jun 1972:Vol. 176, Issue 4042, pp. XV-XVIDOI: 10.1126/science.176.4042.0XV Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears above.
Science Vol 176, Issue 404230 June 1972 Table of Contents Print Table of Contents Ed Board (PDF) Front Matter (PDF)