LettersDiscussion PEDOLOGY OR CHTHONOLOGY? See allHide authors and affiliations Science 17 Jan 1930:Vol. 71, Issue 1829, pp. 70DOI: 10.1126/science.71.1829.70 William A. HamorFind 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 71, Issue 182917 January 1930 Table of Contents Print Table of Contents Front Matter (PDF)