Title supplied by cataloger based on information from sheet labels. Images are photoreductions of mosaics created from original aerial photographs. Designating symbol BZO. Form of individual image numbering: BZO-1LL-[number]. Source: Soil Conservation Service. Year Flown 1970. Scale 1:38,000 Contact the Map Collection at The University of Iowa Libraries: http://www.lib.uiowa.edu/maps/contact/ Scanned at 300 ppi in Greyscale.