Flights flown between July 27, 1939 and September 4, 1939 by Midwest Aerial Surveys, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered BXE-1-2 through BXE-5-114. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Ogle County (Ill.) / W0894100-W0885600 / N0421200-N0415300
Illinois State Geological Survey
474 remote-sensing images, 3.00 gigabytes, average file 6.48 megabytes
Scanned from 7 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.
Mode of access: World Wide Web. System requirements: Plug-in or image viewer, ExpressView Browser plug-in available for download. System requirements for interactive map: Google Chrome best.