Flights flown between June 14, 1938 and June 29, 1938 by Iowa Aerial Surveys, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered BHC-1-3 through BHC-2-110. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Saline County (Ill.) (W 88°42′--W 88°22′/N 37°54′--N 37°36′)
Illinois State Geological Survey
220 remote-sensing images, 1.65 gigabytes, average file 7.69 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.