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Collection: Calvin Geological Photographs
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Iowan geologist J.T. Lonsdale, Iowa, late 1890s or early 1900s
Iowan stage boulders in field, Winthrop, Iowa, late 1890s or early 1900s
Iowan till over Kansan gumbotil, soil on top of the gumbotil, Wayne Township, Iowa, July 8, 1924
View looking east near middle of north line of Section 30 in Wayne Township.
Iowan topography in northwest Iowa, Liberty Township, Iowa, 1925
Located in Liberty Twp., middle of South line, section 34.
Iron bridge with piers of Devonian Limestone, North Liberty, Iowa, late 1890s or early 1900s
Located northwest of North Liberty.
Iron mine, Waukon, Iowa, late 1890s or early 1900s
Located at Waukon, Northeast of, Twp. 99, R. VI, Section 36, N. W. gr., S. E. 1/4
Jim Creek canyon and part of roadway above Seltzer Spring on the way to Jamestown, Colo., late 1890s or early 1900s
Jim Creek from the pipe line, Jamestown, Colo., late 1890s or early 1900s
Jimtown Gateway from Red Mountain to the canyon of Left Hand Creek, Colo., late 1890s or early 1900s
Jimtown Mill, Colo., late 1890s or early 1900s
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