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Collection: Calvin Geological Photographs
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Masses in situ on plain underlain by Buchanan gravels, Manchester, Iowa, late 1890s or early 1900s
Men and boys surrounding “Jumbo” artesian well, Belle Plaine, Iowa, late 1890s or early 1900s
Artesian well/Jumbo well, 3 ft in diameter at surface, 195 deep through fine sand and blue clay. Bored with 2 inch drill. Water broke out. pressure 35 lbs to sq in.
Men around gushing well, Belle Plaine, Iowa, late 1890s or early 1900s
Men by conglomerate basal with lentils of unconformity near base, Montpelier, Iowa, late 1890s or early 1900s
Men in quarry in Devonian limestone, Cedar Valley Stage, Iowa City, Iowa, late 1890s or early 1900s
Men on pile of boulders, Forest City township, Iowa, July 4, 1925
Forest City Twp., lane between sections 13 and 32
Men on railroad cars near Iowa Ballast and Construction Co., Maxon, Iowa, late 1890s or early 1900s
Mill on the Oneota River , Florenceville, Iowa, late 1890s or early 1900s
Picture taken from bridge at Florenceville.
Mill on the Wapsipinicon River, Littleton, Iowa, late 1890s or early 1900s
Mine at Mt. Iron, Minn., late 1890s or early 1900s
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