Articles University Organization for Geophysics Education See allHide authors and affiliations Science 30 Oct 1964:Vol. 146, Issue 3644, pp. 619-621DOI: 10.1126/science.146.3644.619 Werner A. BaumFind 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 146, Issue 364430 October 1964 Table of Contents Print Table of Contents Ed Board (PDF) Front Matter (PDF)
