Title supplied by cataloger based on information from sheet labels. Images are photoreductions of mosaics created from original aerial photographs. Designating symbol FV form of individual image numbering: FV-1-[number], FV-2-[number], FV-3-[number], FV-4-[number], FV-5-[number], FV-6-[number] or FV-7-[number]. Date of publication inferred from dates on individual photographs within the mosaic. Flown by Wallace Aerial Surveys, Spokane, Wash."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/