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Collection: Calvin Geological Photographs
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Quarry in Galena Limestone, Twin Springs, Iowa, late 1890s or early 1900s
Quarry in Upper Coal Measures, old workings showing separation of stone into ledges, Earlham, Iowa, late 1890s or early 1900s
Quarry of Saint Croix overlain by Oneota limestone, Harpers Ferry, Iowa, late 1890s or early 1900s
Quarry is about 100 feet above base of bluff in Oneota.
Quarry with lower quarry beds of Niagaran, Farley, Iowa, late 1890s or early 1900s
Quarry with Niagaran Limestone and Le Claire limestone, Sugar Creek, Iowa, late 1890s or early 1900s
Quarry, Olin, Iowa, late 1890s or early 1900s
Quartzite concretions in Redrock Sandstone, Iowa, late 1890s or early 1900s
Queen Bee Mill behind ledges of Sioux Quartzite at Sioux Falls, S.D., late 1890s or early 1900s
Raccoon River Valley, south of Carrollton, Iowa, late 1890s or early 1900s
Railroad along stream in Boulder Creek Canyon, Colo., late 1890s or early 1900s
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