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Geology -- Iowa.

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View Resource Calvin Photographic Collection

Provided by the University of Iowa, this site is another fine example of how the Internet allows worldwide access to unique collections that might otherwise go unnoticed. Samuel Calvin, Professor of Natural Sciences at the University of Iowa (1873-1911) and State Geologist, along with his colleagues, produced some 10,000 gelatin dry plates and glass plate negatives between 1880s and the 1920s....

https://uiowa.edu/calvin/