Flights flown between June 27, 1938 and August 18, 1938 by Park Aerial Surveys, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered SC-1-24 through SB SC-41-3731. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Brown County (Ill.) (W 90°55′--W 90°31′/N 40°06′--N 39°50′)
Illinois State Geological Survey
242 remote-sensing images, 665 megabytes, average file 2.7 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.