Flight flown September 22, 1941 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered BGI-1B-5 through BGI-2B-200. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
DeWitt County (Ill.) (W 89°09′--W 88°35′/N 40°17′--N 40°04′)
Illinois State Geological Survey
218 remote-sensing images, 1.28 gigabytes, average file 6.05 megabytes
Scanned from 9 x 9 contact prints (nominal scale ca. 1:20,000) on Crosfield Celsis 6200 drum scanning system at 750 dpi. Quality assurance target not published but available by contacting the Illinois State Library Map Dept. MrSID files compressed at a target ratio of 6:1. Uncompressed TIFF images on cd available from the Illinois State Library Map Dept.