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Samuel Ottmar Mast (1871-1947) was a biologist and zoologist at Johns Hopkins University. The collection consists of correspondence, administrative information related to running an academic department, and reprints of articles. The collection materials range in date from 1912 to 1947.
- Names: Bowman, Isaiah, 1878-1950
- Names: Cattell, James McKeen, 1860-1944
- Subject: Hydrogen-ion concentration