Flights flown between August 29, 1941 and September 19, 1941 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered SJ-1B-3 through SJ-5B-93. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Madison County (Ill.) (W 90°17′--W 89°36′/N 39°00′--N 38°39′)
Illinois State Geological Survey
410 remote-sensing images, 1.4 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.