Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs. Designating symbol TH. Form of individual image numbering: TH-2R-[number], TH-3R-[number], or TH-4R-[number]."Flying completed 9-7-56" Flown by Woltz Studios, Inc. Des Moines, Iowa. "Approximate scale, 1:20,000" [refers to individual images from which mosaic was made].
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