1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 83 x 113 cm Negative. "Effective acreage = total farm land leass land in forest, waste, buildings, roads, and feed lots." "Iowa... Iowa. State Planning Board.
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1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 84 x 115 cm Negative. "Iowa state plan." "Project 1030." "1030-10.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 83 x 115 cm Negative. "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 116 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 115 cm Negative. "Project 1030." "1030-13.". Iowa. State Planning Board.
1900. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 84 x 115 cm Negative. "Iowa state plan." "Project 1030." "1030-28.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 84 x 115 cm Negative. "Project 1030." "1030-8.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 84 x 114 cm Negative. "Project 1030." "1030-6.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 71 x 110 cm Iowa state plan. "Project 1030." "1030-11.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Land Utilization. 1 map black line ; 83 x 116 cm Negative. "Iowa state plan." "Project no. 1030.". Iowa. State Planning Board.