1930. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1925-1926.";Relief shown by contours and spot heights.;Shows roadway classification as of 1929.;1 map, color... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1930. Geological Survey (U.S.). Contour interval 20 feet.;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.";"Surveyed in 1927.";Relief... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1930. Geological Survey (U.S.). Contour interval 20 feet.;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.";"Surveyed in 1926-1927.";R... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1930. Geological Survey (U.S.). Contour interval 20 feet;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army";"Surveyed in 1926-1927";Reli... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1930. Iowa. State Planning Board. Committee on Population & Social Trends. 1 map black line ; 84 x 115 cm Negative. "Iowa state plan." "Project 1048.". Iowa. State Planning Board.
1930. County plat books from W.W. Hixson & Co. published in 1930 throughout the state of Iowa.
1930. Sinn, Eugene and Iowa. State Planning Board. Committee on Population and Social Trends. 44 leaves tables ; 29 cm. Iowa. State Planning Board.
1930. Bureau of the Census--1930. Scale approximately 1:500,000. U.S. G.P.O.
1930. Iowa. State Planning Board. Committee on business and industry. 29 leaves ; 28 cm "Project 1040-1041.". Iowa. State Planning Board.
1930. Sanborn Map Company. Updated with pasteover slips and additional sheets. Date of last revision varies between 1924-1930. Each volume includes a map of ward lines and di... Sanborn Map Company (New York), 1913.