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Yield of oats: average yield of oats by districts: 5 year average 1928-1932
Iowa. State Planning Board
Negative. "Iowa state plan." "Project 1030." "1030-16."
1920-1930 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
663976190; index.cpd MAPG4151_J61_1932_I62