Title supplied by cataloger based on information from sheet labels. Images are photoreductions of mosaics created from original aerial photographs. Designating symbol GC; form of individual image numbering: GC-1-[number], GC-2-[number], GC-3-[number], GC-4-[number], GC-5-[number], GC-6-[number], or GC-7-[number]."Date of completion 06-21-37" Flown by Woltz Studio Inc." aerial surveys."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. Contact the Map Collection at The University of Iowa Libraries: http://www.lib.uiowa.edu/maps/contact/