Sierra Leone 1:50,000 (approx.).
Great Britain.Directorate of Overseas Surveys.
Mackenzie, D. H.(David H.)
Sierra Leone Geological Survey.
[Tolworth, Surrey] : Published by the Directorate of Overseas Survey for the Gov't. of Sierra Leone,
1962-63.
Relief shown by spot heights.
"Geologically surveyed by David H. Mackenzie 1957 and 1959-1960. Topography compiled by Geological Survey Department, Sierra Leone, from air photography by Aircraft Operating Co. (Aerial Surveys) Ltd., Contract 23, 1956."
"The geology of sheets 87, 98 and 99 is described in Bulletin No. 3."
Includes adjoining sheets index map and notes.
"WOPD/180/OA."
Geology
Geology