1930. Iowa. State Planning Board. Committee on Land Purchase & Mortgage. 1 map black line ; 84 x 115 cm Iowa state plan. "Project no. 1031.". Iowa. State Planning Board.
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1920. Iowa. State Planning Board. Committee on Land Purchase & Mortgage. 1 map black line ; 84 x 115 cm Iowa state plan. "Project no. 1031.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Land Purchase & Mortgage. 1 map black line ; 84 x 114 cm Iowa state plan. "Project no. 1031.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Land Purchase & Mortgage. 1 map black line ; 71 x 110 cm Iowa state plan. "Project no. 1031.". Iowa. State Planning Board.
1900. Calvin, S. (Samuel), 1840-1911. 1 map Scale not given. Iowa Geological Survey.
1920. Kay, George F. (George Frederick), 1873-1943. 1 map Scale not given. Iowa Geological Survey.
1810. Lewis, Samuel, 1753 or 4-1822. 1 map Scale approximately 1:4,400,000. Longman, Hurst, Rees, Orme & Brown.
1850. Thomas, Cowperthwait & Co. 1 map : color Scale approximately 1:1,805,760 W 97°00′--W 89°07′/N 44°30′--N 39°46′. Thomas, Cowperthwait & Co.
1850. Thomas, Cowperthwait & Co. 1 color map 30 x 37 cm, on sheet 35 x 42 cm Scale [ca. 1:1,805,760]. Thomas, Cowperthwait & Co.
1850. Thomas, Cowperthwait & Co. 1 color map 30 x 37 cm, on sheet 35 x 43 cm. Scale [ca. 1:1,805,760]. Thomas, Cowperthwait & Co.