Flights flown between May 25, 1938 and June 27, 1938 by Iowa Aerial Surveys, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered BHJ-1-1 through BHJ-3-30. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
White County (Ill.) (W 88°22′--W 87°54′/N 38°15′--N 37°53′)
Illinois State Geological Survey
234 remote-sensing images, 1.78 gigabytes, average file 7.81 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 6:1. Uncompressed TIFF images on cd available from the Illinois State Library Map Dept.