Iowa. State Planning Board. Committee on Land UtilizationNegative. "Iowa state plan." "Project 1030." "1030-28."1 map : black line ; 84 x 115 cm663975378; index.cpdMAPG4151_G47_1930_I62islandora: testiadep_1751https://digital.lib.uiowa.edu/node/168262engUniversity of Northern IowaPublicFarm tenancy: percent of farms operated by tenants 1900-1930MapsIowa1900-19101910-19201920-1930University of Iowa