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Yield of corn: average yield of corn in bushels per acre, by region 1928-1932: state average 37.57
Iowa. State Planning Board. Committee on Land Utilization
Iowa. State Planning Board
Negative. "Iowa state plan." "Project 1030." "1030-17."
1930-1940
United States
Iowa
Iowa State Planning Board Maps
1 map : black line ; 84 x 115 cm
University of Northern Iowa
Material in the public domain. No restrictions on use.
Contact the University of Iowa Libraries Map Collection: http://www.lib.uiowa.edu/maps/
maps (documents)
jp2
706118305; MAPG4151_J61_1932_I6.jp2