PHOTOGRAPHY - High-altitude UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Water Resources Division Washington 25, D.C. In reply refer to: December 29, 1958 Code 4052 0001 GROUND WATER BRANCH MEMORANDUM NO. 59.26 To: District Chiefs and Staff Officials, Ground Water Branch From: Chief, Ground Water Branch, Washington, D.C. Subject: PHOTOGRAPHY - High-altitude Attached for your information and use is the latest index map of the United States, showing the availability of high-altitude photography and related materials. Information regarding the material available and the method of procuring it is given on the back of the map. Your attention is called to the availability of Stereo-manuscripts, or 200-foot supplemental contour. These manuscripts of flat terrain carry a 50-foot supplemental contour. These manuscripts were used in compiling the small scale (1:250,000) contour maps prepared by the Army Map Service, and are available for most of the United States. The manuscripts generally show section or township lines; however, they should be of considerable value for work in areas not covered by Standard Survey Topographic Maps. (s) A.N. Sayre Attachment FO-L3, SL only Distribution: A, B, S3, FO-L3, SL