Iowa Heritage Digital Collections
State Library of Iowa

Browse Items (748 total) for Calvin Geological Photographs

Kansan gumbotil, soil, and Iowan till, Wayne Township, Iowa, July 8, 1924
Kansan section showing Peorian loess on Kansan gumbotil, oxidized and leached till, ox, and unleached till, Oregon Township, Iowa, August 1933
Kansan till, loess and Wisconsin till, Cass Township, Iowa, July 18, 1924
Kansan topography, Welton Township, Iowa, June 18, 1925
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