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Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
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Castle of Galena limestone near Catfish Creek and Illinois Central Railroad, Dubuque, Iowa, late 1890s or early 1900s
Located west of Dubuque.
Cascades in Big Thomson Creek at entrance to Willow Park, Estes Park, Colo., late 1890s to early 1900s
Cascade in winter, Burlington, Iowa, late 1890s or early 1900s
Carboniferous, Mena, Iowa, late 1890s or early 1900s
Located east of Mena, Ark.
Carboniferous, Mena, Ark., late 1890s or early 1900s
Located east of Mena, Ark.
Carboniferous, Mena, Ark., late 1890s or early 1900s
Mena
Carboniferous shale, Mena, Ark., late 1890s or early 1900s
Located east of Mena, Arkansas.
Carboniferous sandstone cliffs near Boneyard Hollow in Dolliver Memorial State Park, Lehigh, Iowa, late 1890s or early 1900s
Carboniferous sandstone and shale, showing irregular bedding, Wyoming Hill, Iowa, late 1890s or early 1900s
Carboniferous outlier, Iowa City, Iowa, late 1890s or early 1900s
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