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Collection: Calvin Geological Photographs
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Aftonian, Kansan Drift, Buchanan gravels, Illinoian Drift, Sangamon sands, and Loess, Muscatine, Iowa, late 1890s or early 1900s
See 553, same view, beds lettered.
Aftonian, Kansan Drift, Buchanan gravels, Illinoian Drift, Sangamon sands, and Loess, Muscatine, Iowa, late 1890s or early 1900s
See 553 and 554, same view, beds lettered.
Alpine Glaciers, late 1890s or early 1900s
American Association of Geographers Davis Excursion, St. Paul, Minn., 1912
American Mine, Evans, Iowa, late 1890s or early 1900s
Anamosa Stage in McCune Quarry, Cedar Township, Iowa, late 1890s or early 1900s
Anamosa Stage, Cedar Bluff, Iowa, late 1890s or early 1900s
Anamosa Stage, Niagaran overlain by boulder, and till containing streaks of sand at F. Thielman's Quarry, LeClaire, Iowa, late 1890s or early 1900s
Atwood Quarry, Iowa, late 1890s or early 1900s
Automobile in front of Loveland type cut, Loveland, Iowa, 1925
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