Gorgoram, sheet 40 Nigeria 1:100,000 / Drawn & reproduced by Federal Surveys, Nigeria, 1961.

First Edition

"Compiled and drawn by Federal Surveys, Nigeria, from photo-reductions of 1:50,000 Sheets 40 N.W., N.E., S.W., and S.E. which were constructed and published in 1959 by the Directorate of Overseas Surveys from aerial photographs taken by Royal Air Force in 1950." Relief shown by contours, hachures, form lines and spot heights. Contour interval is 100 feet. Shows grid, roads, railways, boundaries, vegetation, cultural features, and other details. Shows reference benchmarks, photogrammetric control, and trigonometric stations. Includes legend, magnetic north diaagram, index to adjoining sheets, reliability diagram, and sheet history. Some sheets include coordinate and measurement unit information, boundary diagram, and boundary note. Index from University of California, map collection.: http://www.lib.berkeley.edu/EART/indexes/G8840_s100_n5_index.jpg

Color;

1:100,000