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Calvin Photographic Collection
A collection of 800 photographs that document Iowa's geological landscapes and features, along with "mines, quarries, mills, and other buildings," taken by Samuel Calvin, Professor of Natural Sciences at the University of Iowa (1873-1911) and State Geologist. Browsable by theme or by Iowa county, U.S. state, or Canadian province. Includes a brief biography of Calvin. From the University of Iowa.
http://www.uiowa.edu/~calvin/

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