Flights flown between June 19, 1940 and August 13, 1940 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered AP-1A-1 through AP-5A-95. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Champaign County (Ill.) (W 88°28′--W 87°56′/N 40°24′--N 39°53′)
Illinois State Geological Survey
533 remote-sensing images, 1.78 gigabytes, average file 3.4 megabytes
Scanned from 9 x 9 contact prints (nominal scale ca. 1:20,000) on Crosfield 646IE 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 12:1. Uncompressed TIFF images on cd available from the Illinois State Library Map Dept.