Flights flown between June 25, 1940 and August 23, 1940 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered Y-2A-2 through Y-6A-58. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Ford County (Ill.) / W0882800-W0875600 / N0410000-N0402400
Illinois State Geological Survey
270 remote-sensing images, 1.78 gigabytes, average file 6.76 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.