1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 83 x 113 cm Negative. "Iowa state plan." "Project 1030.". Iowa. State Planning Board.
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1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 84 x 114 cm Negative. "Iowa state plan." "Project no. 1030." "1030-21.". Iowa. State Planning Board.
1920. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 84 x 115 cm Negative. "Iowa state plan." "Project 1030." "1030-15.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 83 x 113 cm Iowa state plan. "Project no. 1030.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map ; black line; 84 x 113 cm Negative.; "Iowa state plan."; "Project 1030.". 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 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.
18. Yield of corn average yield of corn in bushels per acre, by region 1928-1932 state average 37.57
1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 84 x 115 cm Negative. "Iowa state plan." "Project 1030." "1030-17.". Iowa. State Planning Board.