Flight flown August 9, 1941 by Woltz Studios, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered RY-1B-3 through RY-1B-109. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
McDonough County (Ill.) / W0905500-W0902600 / N0403800-N0401700
Illinois State Geological Survey
90 remote-sensing images, 0.71 gigabytes, average file 8.11 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.
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.