Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs. Designating symbol BKO. Form of individual image numbering: BKO-1G-[number], BKO-2G-[number], BKO-3G-[number], or BKO-4G-[number]."Flying completed 8-20-50" Flown by Aero Service Corp. Philidelphia, Pa. "Approximate scale, 1:20,000" [refers to individual images from which mosaic was made].
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