Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs. Designating symbol BZW. Form of individual image numbering: BZW-2-[number], BZW-3-[number], or BZW-4-[number]. Flown by Aero Service Corp., Philidelphia, Pa."Date of completion Sept. 4, 1939.""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/