Flights flown between July 27, 1938 and August 23, 1938 by Iowa Aerial Surveys, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered BHA-1-3 through BHA-1-185. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Pulaski County (Ill.) (W 89°17′--W 88°56′/N 37°20′--N 37°03′)
Illinois State Geological Survey
142 remote-sensing images, 554 megabytes, average file 3.9 megabytes
Scanned from 9 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.