Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs. Designating symbol BKL; form of individual image numbering: BKL-1-[number], BKL-2-[number], BKL-3-[number], or BKL-4-[number]."Date of completion December 10, 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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