1907
Great Britain. General Staff. Topographical Section.
1960
Federal Surveys, Nigeria (Revision)
1:1m
1967
USSR (Union of Soviet Socialist Republics).
1:4m
1856
Taylor, Bayard.
1896
Langhans, Paul
1:2m
1952
Willinks Commission
1912
Great Britain. General Staff. Geographical Section.
1905
Scobel, Albert
1:4m
1862
Church Missionary Society.
1:6m
1893
Morgen, Curt von.