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.
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1930. Iowa. State Planning Board. Committee on Population Social Trends. 1 map black line ; 83 x 115 cm Negative. "Iowa state plan." "Project 1048." "1048-21.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Water Flow & Supply & Stream Pollution. 1 map black line ; 83 x 114 cm Iowa state plan. "Project 1044." "1044-13.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Water Resources Committee. 1 map black line ; 83 x 114 cm Iowa state plan. "W.P.A. project 962.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. 1 volume (no pagination) ; 22 cm. Iowa. State Planning Board.
1930. Iowa. State Planning Board and Iowa State Conservation Commission. Biological Survey Unit. 20 leaves illustrations ; 29 cm. Iowa. State Planning Board.
107. 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.
1920. Iowa. State Planning Board. 1 map black line ; 84 x 115 cm Negative. "Iowa state plan." "Project 1030." "1030-16.". Iowa. State Planning Board.