International records / UK National Archives
Nigeria. Cape Formoso to Gernando Po, surveyed by Capt W.F. Owen, 1826, and Capt A.T.E....
FO 925/716 | Foreign Office: Library: Maps and Plans. | Nigeria. Cape Formoso to Gernando Po, surveyed by Capt W.F. Owen, 1826, and Capt A.T.E. Vidal and Lt. Bedford 1836-1838. Admiralty Chart 1357. About 11 sea miles to an inch. Admiralty.
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