Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs. Designating symbol BZH. Form of individual image numbering: BZH-1-[number], BZH-2-[number], or BZH-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].
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