Title supplied by cataloger based on information from sheet labels. Images are photoreductions of mosaics created from original aerial photographs. Designating symbol BKV; form of individual image numbering: BKV-1-[number], BKV-2-[number], BKV-3-[number], BKV-4-[number], BKV-6-[number], BKV-7-[number], or BKV-8-[number]. Survey began in 1938. "Date of completion Jan. 10, 1939". 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. Contact the Map Collection at The University of Iowa Libraries: http://www.lib.uiowa.edu/maps/contact/