1930. Iowa. State Planning Board. Committee on Population Social Trends. 1 map black line ; 83 x 116 cm Negative. "Iowa state plan." "Project no. 1048.". Iowa. State Planning Board.
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1930. Iowa. State Planning Board. Committee on Population Social Trends. 1 map black line ; 84 x 115 cm Negative. "Iowa state plan." "Project 1048." "1048-19.". Iowa. State Planning Board.
3. Farms with automobiles percentage of farms having automobiles, state average 90.2, by counties 1930
1930. Iowa. State Planning Board. Committee on Population Social Trends. 1 map black line ; 83 x 115 cm Negative. "Iowa state plan." "Project 1048." "1048-14.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Population Social Trends. 1 map black line ; 84 x 115 cm Negative. "Iowa state plan." "Project 1048." "1048-18.". Iowa. State Planning Board.
1930. Iowa. State Planning Board. Committee on Population Social Trends. 1 map black line ; 84 x 115 cm Negative. "Iowa state plan." "Project 1048." "1048-17.". Iowa. State Planning Board.
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.