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Admiralty Chart for "Cabo de São Vicente to the Strait of Gibraltar. From Spanish and Portuguese Charts, 1950-1966 & from Surveys by Capt. G.S. Ritchie, D.S.C.,R.N, and Comdr J.A. Paton, R.N., H.M. Surveying Ships 'Vidal' and 'Owen', 1964-5. With additions and corrections to 1968. Folio No. 92."
