Letters Clipping Conflict: Some Solutions + See all authors and affiliations Science 27 Dec 1963:Vol. 142, Issue 3600, pp. 1621DOI: 10.1126/science.142.3600.1621-a Henry EckhardtFind 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 below.
Science Vol 142, Issue 360027 December 1963 Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)
