Title supplied by cataloger based on information from sheet labels. Images are photoreductions of mosaics created from original aerial photographs. Designating symbol BKP. Form of individual image numbering: BKP-1G-[number], BKP-2G-[number], BKP-3G-[number], or BKP-4G-[number]."Flying completed 10-3-50" Flown by Aero Service Corp. Philidelphia, Pa."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/