Flights flown between July 16, 1941 and August 29, 1941 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered SI-1B-3 through SI-3B-177. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Jersey County (Ill.) (W 90°36′--W 90°09′/N 39°16′--N 38°55′)
Illinois State Geological Survey
234 remote-sensing images, 847 megabytes, average file 3.6 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.