1990. University of Iowa. 14 × 25 cm. University of Iowa.
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1990. University of Iowa. 14 × 25 cm. University of Iowa.
2000. University of Iowa. 13 × 24 cm. University of Iowa.
2000. University of Iowa. 14 × 26 cm. University of Iowa.
1940. Von Berg, John. 28 × 33 cm. University of Iowa.
1980. University of Iowa. 28 × 43 cm. University of Iowa.
3409. Use of crop land distribution of total land in crops into the principal crops, by region, 1932
1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 84 x 114 cm Negative. "Iowa state plan." "Project 1030." "1030-27.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 84 x 114 cm Negative. "Iowa state plan." "Project no. 1030." "1030-22.". Iowa. State Planning Board.