LettersDiscussion and Correspondence CROSS CUTTING AND RETROGRADING OF STREAMBEDS By F. S. Dellenbaugh See allHide authors and affiliations Science 26 Apr 1912:Vol. 35, Issue 904, pp. 656-658DOI: 10.1126/science.35.904.656 F. S. DellenbaughFind 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 above.