Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs. Designating symbol CAB. Form of individual image numbering: CAB-2-[number], or CAB-3-[number]. Flown by Aero Service Corp. Philidelphia, Pa. Date of publication inferred from dates on individual photographs within the mosaic. "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/