Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs. Designating symbol BZK. Form of individual image numbering: BZK-2-[number], BZK-4-[number], or BZK-5-[number]. Flown by Aero Service Corp. Philidelphia, Pa."Date of completion July 29, 1939""Approximate scale, 1:20,000" [refers to individual images from which mosaic was made].
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