Flights flown between July 1, 1940 and August 7, 1940 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered AO-2A-80 through AO-4A-151. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Douglas County (Ill.) (W 88°28′--W 87°56′/N 39°53′--N 39°39′)
Illinois State Geological Survey
222 remote-sensing images, 1.42 gigabytes, average file 6.57 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.