interpretation by William C. Overstreet [and others] ; prepared by the U.S. Geological Survey for the Federal Capital Development Authority of Nigeria. "Special digital image processing of LANDSAT Scene ID 1520-09181, imaged Dec. 25, 1973, carried out by Image-Processing Facility, U.S.G.S. Flagstaff Field Center, Flagstaff, Arizona." Includes 2 location maps and text.