Title supplied by cataloger based on information from sheet label. Image is a photoreduction of the mosaic created from original aerial photographs. Designating symbol TD. Form of individual image numbering: TD-1B-[number], or TD-2B-[number]."Flying completed July 24, 1941." Flown by Park Aerial Surveys, Inc. Louisville, Kentucky. "Approximate scale, 1:20,000" [refers to individual images from which mosaic was made]. Contact the Map Collection at The University of Iowa Libraries: http://www.lib.uiowa.edu/maps/contact/