Flights flown between July 1, 1940 and July 26, 1940 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered X-1A-3 through X-5A-188. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
McLean County (Ill.) / W0891600-W0882800 / N0404500-N0401700
Illinois State Geological Survey
627 remote-sensing images, 4.16 gigabytes, average file 6.80 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.