1930. Iowa. State Planning Board. Water Resources Committee. 1 map black line, hand colored ; 83 x 114 cm W.P.A. project no. 962. "Iowa state plan.". Iowa. State Planning Board.
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1930. Iowa. State Planning Board. Water Resources Committee. 1 map black line ; 83 x 114 cm W.P.A. project no. 962. "Iowa state plan.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Water Resources Committee. 1 map ; black line, plastic; 56 x 48 cm WPA project no. 962. 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. 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. 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. Water Resources Committee. 1 map black line ; 83 x 114 cm Iowa state plan. "W.P.A. project 962.". Iowa. State Planning Board.