Flights flown between July 5, 1940 and July 29, 1940 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered AL-1A-2 through AL-4A-40. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Vermilion County (Ill.) (W 87°56′--W 87°31′/N 40°29′--N 39°52′)
Illinois State Geological Survey
473 remote-sensing images, 1.6 gigabytes, average file 3.5 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.