Title supplied by cataloger based on information from sheet labels. Images are photoreductions of mosaics created from original aerial photographs. Designating symbol BKT. Form of individual image numbering: BKT-1CC-[number]."Year flown 1961" Flown by Woltz Studios, Inc. Des Moines, 13, 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/