Flights flown between July 24, 1938 and August 11, 1938 by Park Aerial Surveys, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered SA RX-27-2451 through RX RV-41-3674. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Hancock County (Ill.) (W 91°30′--W 90°55′/N 40°38′--N 40°11′)
Illinois State Geological Survey
537 remote-sensing images, 1.47 gigabytes, average file 2.8 megabytes
Scanned from 7 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.