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Amgueddfa Cymru – Museum Wales
Admiralty Chart for "England - East Coast, Thames Estuary Southern Part. From surveys by the Admiralty and Port of London Authority to 1971. With additions and corrections to 1972. The Topography is taken chiefly from Ordnance Survey". Folio No. L(D5)1607. (AB.AC) DECCA CHART - Chain 5B/MP (English).