Flights flown between August 21, 1938 and September 9, 1938 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered RT-7-423 through RT-33-2792. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Mercer County (Ill.) / W0910700-W0902600 / N0412000-N0410400
Illinois State Geological Survey
364 remote-sensing images, 2.05 gigabytes, average file 5.78 megabytes
Scanned from 7 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.