Title supplied by cataloger based on information from sheet labels. Images are photoreductions of mosaics created from original aerial photographs. Designating symbol 19197. Form of individual image numbering: 19197-172[number]. Year Flown 1972. Flown by Surdex Corporation, St. Louis, MO. Scale, 1:40,000 Contact the Map Collection at The University of Iowa Libraries: http://www.lib.uiowa.edu/maps/contact/ Scanned at 300 ppi in Greyscale.