Flights flown between July 7, 1938 and October 21, 1938 by Iowa Aerial Surveys, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered BGZ-1-34 through BGZ-4-13. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Pope County (Ill.) (W 88°42′--W 88°25′/N 37°36′--N 37°04′)
Illinois State Geological Survey
188 remote-sensing images, 1.39 gigabytes, average file 7.58 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 12:1. Uncompressed TIFF images on cd available from the Illinois State Library Map Dept.