Iowa. State Planning Board. Committee on Population Social Trends1 map black line ; 83 x 115 cmNegative. "Iowa state plan." "Project 1048." "1048-21."JPEGui:testiadep_1745engIowa. State Planning BoardPublicValue of farm dwellings 1930 average value of dwellings per farm by townships, state average $2,212.00MapsIowa1930-1940University of Iowa