Pettijohn, F. J. (Francis John), 1904-1999
- Existence: 1904 - 1999
Found in 1 Collection or Record:
Ernst Cloos (1898-1974) was a structural geologist and professor at The Johns Hopkins University. The collection documents Cloos's field work and research through his meticulous, detailed field notebooks and research data dating from 1921-1980.
- Subject: Maryland--Washington County X