Draft:Frank C. Calkins
Frank Cathcart Calkins (June 7, 1878 – December 31, 1974) was an American geologist, petrologist, and mapper.
References[edit]
- Calkins, Frank C. (1973–1974). [Letters] – via Archives West.
- Communications and Publishing (April 13, 2016). "Yosemite Science". U.S. Geological Survey.
- Crittenden, Max D. Jr. (February 1977). "Memorial to Frank Cathcart Calkins" (PDF). Memorials. 6. Geological Society of America.
- "Leading geologist Frank Calkins dies". Palo Alto Times. 83 (3): 15. January 3, 1975 – via Newspapers.com.
- Matthes, François E. (1930). Geologic History of the Yosemite Valley. Geological Survey Professional Paper 160. U.S. Department of the Interior. doi:10.3133/pp160.
- McCarthy, Guy (November 7, 2022). "New research indicates the famous Yosemite Valley landscape isn't as old as previously believed". The Union Democrat.
Further reading[edit]
- The U.S. Geological Survey in the early 1900s. U.S. Geological Survey Open-File Report 97-267-C. 1998. OCLC 40409245.