Flights flown between July 23, 1938 and October 14, 1938 by Iowa Aerial Surveys, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered BGA-1-2 through BGA-3-71. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Bond County (Ill.) / W0893800-W0891500 / N0390200-N0384500
Illinois State Geological Survey
202 remote-sensing images, 1.61 gigabytes, average file 8.16 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.