Flights flown between September 20, 1941 and September 26, 1941 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered BGU-1B-4 through BGU-4B-102. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Macon County (Ill.) / W0891300-W0884500 / N0400400-N0393900
Illinois State Geological Survey
308 remote-sensing images, 2.02 gigabytes, average file 6.70 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.