Gannett, Henry, 1846-1914. by Henry Gannett. From its Annual report, 19th, part V, pl. II. Relief shown by contours. The Survey.
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compiled and drawn by Survey Depot (Tech.) S.A.E.C., 1944 ; prepared and drawn by the Trigomnometrical Survey Office, 1953. English and Afrikaans. The Survey.