Iowa. State Planning Board. Committee on Land UtilizationNegative. "Iowa state plan." "Project 1030."1 map : black line ; 83 x 113 cmJPEG2000733818671; MAPG4151_G4_193_I6.jp2islandora: testiadep_1798https://digital.lib.uiowa.edu/node/513633engUniversity of Northern IowaPublicPermanent pasture & forest: Iowa: percent of total farm area recomended for forest or permanent pasture: based on soil survey by Soils Dept., Iowa State CollegeMapsIowa1930-1940University of Iowa