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Collection: Calvin Geological Photographs
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Profile of Painted Rock, Waukon Junction, Iowa, late 1890s or early 1900s
Projecting block of Galena Limestone, receptaculites horizon 60 feet below top of Galena located southeast of Rockville, Iowa, late 1890s or early 1900s
Purple limestone of red beds, Chatauqua grounds, Hot Springs, S.D., late 1890s or early 1900s
Purple limestone of red beds, upper end of Chautauqua grounds, Hot Springs, S.D., late 1890s or early 1900s
Quarry east of Earlville, Iowa, late 1890s or early 1900s
Quarry in Anamosa Stage of Niagaran, Le Claire, Iowa, late 1890s or early 1900s
Quarry in Devonian dolomite near the Oneota River north of the bridge, Forreston, Iowa, late 1890s or early 1900s
Quarry in Devonian limestone, Cedar Valley Stage, showing two parallel joints, Iowa City, Iowa, late 1890s or early 1900s
Quarry in Devonian Limestone, near Iron Bridge, northwest of North Liberty, Iowa, late 1890s or early 1900s
Located in Twp. 81, R. VII, Section 22
Quarry in Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s
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