Flights flown between August 16, 1937 and June 28, 1938 by Park Aerial Surveys, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered SH-5-327 through SH-30-1867. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Greene County (Ill.) (W 90°37′--W 90°09′/N 39°32′--N 39°07′)
Illinois State Geological Survey
439 remote-sensing images, 1.19 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.