Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs. Designating symbol BKT; form of individual image numbering: BKT-1-[number], BKT-2-[number], BKT-3-[number],BKT-4-[number], BKT-5-[number], BKT-6-[number], or BKT-7-[number]."Date of completion November 6, 1938" Flown by Iowa Aerial Surveys, Des Moines, Iowa. "Approximate scale, 1:20,000" [refers to individual images from which mosaic was made]. Library's copy 2 consists of photographic negatives (4 x 5 in.) corresponding to each of the images in its copy 1.
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