Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs. Designating symbol BZN. Form of individual image numbering: BZN-2-[number], BZN-3-[number], or BZN-4-[number]. Flown by Aero Service Corp. Philidelphia, Pa.""Date of completion Aug. 29, 1939""Approximate scale, 1:20,000" [refers to individual images from which mosaic was made].
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