Title supplied by cataloger based on information from sheet labels. Images are photoreductions of mosaics created from original aerial photographs. Designating symbol FT form of individual image numbering: FT-1-[number], FT-3-[number], FT-4-[number], FT-5-[number], or FT-6-[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/