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Amgueddfa Cymru – Museum Wales
Admiralty Chart for "British Isles, Plans on the South Coast of Wales (Swansea Bay & Approaches to Porthcawl). From the Survey by Commander C.C.Lowry R.N. and the Officers of H.M.S. Seagull, 1949. With additions and corrections to 1969". Folio No. 1911.