Flights flown between June 29, 1940 and October 19, 1940 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered SM-1A-23 through SM-10A-32. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Randolph County (Ill.) (W 90°13′--W 89°36′/N 38°13′--N 37°47′)
Illinois State Geological Survey
324 remote-sensing images, 1.89 gigabytes, average file 5.98 megabytes
Scanned from 7 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.