Flights flown between July 2, 1940 and July 29, 1940 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered AI-1A-3 through AI-4A-24. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Iroquois County (Ill.) / W0880800-W0873100 / N0413500-N0402900
Illinois State Geological Survey
580 remote-sensing images, 3.90 gigabytes, average file 6.88 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.