1. Nigeria
United States, Central Intelligence Agency. "504014 8-79 (543855)." Relief shown by shading and spot heights. Includes location map and comparative area map. Maps in margin: Population -- Lin... Central Intelligence Agency.
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Richardson, G. B. (George Burr), 1872-1949 and Heald, K. C. (Kenneth Conrad), 1888-1971. compiled under the direction of G.B. Richardson and K.C. Heald ; oil and gas drafting by Lewis B. Pusey. Includes "Index to locations of anticlinal... U.S. Geological Survey.
Richardson, G. B. (George Burr), 1872-1949. compiled under the direction of G.B. Richardson ; oil and gas data compiled and drawn by Lewis B. Pusey ; Department of the Interior, United States... The Survey.
Geological Survey (U.S.) and Richardson, G. B. (George Burr), 1872-1949. Department of the Interior, United States Geological Survey ; compiled under the direction of G.B. Richardson. Also shows pipelines. The Survey.
Geological Survey (U.S.). Relief shown by contours and spot heights. Shows oil wells, reservoirs, tanks, railways, roads, buildings, etc. north of Oil City. The Survey.
Geological Survey (U.S.). U.S. Geological Survey, George Otis Smith, Director; R.B. Marshall, Chief Geographer; Sledge Tatum, Geographer in charge; topography by A.P. Meade,... The Survey.