Title supplied by cataloger based on information from sheet labels. Images are photoreductions of mosaics created from original aerial photographs. Designating symbo DC form of individual image numbering: DC-1-[number], DC-2-[number], DC-3-[number], DC-4-[number], DC-5-[number], or DC-6-[number]. Date of publication inferred from dates on individual photographs within the mosaic. Flown by Aerial Explorations, Inc. New York, N.Y."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/