Title supplied by cataloger based on information from sheet labels. Images are photoreductions of mosaics created from original aerial photographs. Designating symbol FP form of individual image numbering: FP-13-[number], FP-14-[number], FP-15-[number], FP-16-[number], FP-17-[number], or FP-18-[number]. Date of publication inferred from dates on individual photographs within the mosaic. Flown by Gatschet Aerial Surveys, Des Moines, Iowa."Approximate scale, 1:20,000" [refers to individual images from which mosaic was made]. Contact the Map Collection at The University of Iowa Libraries: http://www.lib.uiowa.edu/maps/contact/