1849. Part of a set of digitized microfilm of manuscript maps of Iowa townships. Individual maps in the set may include: Native American villages and fie... United States Surveyor General.
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1849. Part of a set of digitized microfilm of manuscript maps of Iowa townships. Individual maps in the set may include: Native American villages and fie... United States Surveyor General.
1849. Part of a set of digitized microfilm of manuscript maps of Iowa townships. Individual maps in the set may include: Native American villages and fie... United States Surveyor General.
1916. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1913.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma... Geological Survey (U.S.) and State Geological Survey (Urbana, Ill.).
1913. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed 1909 and 1911.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot hei... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1937. Geological Survey (U.S.). Contour interval 10 feet;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army";"Surveyed in 1931-1932";Reli... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1912. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1910.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1940. Geological Survey (U.S.). Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.;"Surveyed in 1934.";Relief shown by contours and spot ... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1927. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1889.";Relief shown by contours and spot heights.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).
1940. Geological Survey (U.S.). Surveyed in 1935;Contour interval 20 feet.;Relief shown by contours and spot heights.;1 map, colored;46 x 34 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).