From Admiralty Surveys to 1925 - corrected to 1945.

Admiralty Chart No 1488 - St. Anne's Head to St. Brides Bay - including the Smalls, Grassholm and Adjacent Islands | National Museums Liverpool

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https://www.liverpoolmuseums.org.uk/artifact/admiralty-chart-no-1488-st-annes-head-st-brides-bay-including-smalls-grassholm-and

Admiralty Chart No 1488 - St. Anne's Head to St. Brides Bay - including the Smalls, Grassholm and Adjacent Islands

http://content.liverpoolmuseums.org.uk/artifact/admiralty-chart-no-1488-st-annes-head-st-brides-bay-including-smalls-grassholm-and