Blue-backed chart (No 77) published by James Imray and Son, London.

Sea Chart - The Coast of Spain and Portugal included between Cape Penas and Gibraltar | National Museums Liverpool

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https://www.liverpoolmuseums.org.uk/artifact/sea-chart-coast-of-spain-and-portugal-included-between-cape-penas-and-gibraltar

Sea Chart - The Coast of Spain and Portugal included between Cape Penas and Gibraltar

http://content.liverpoolmuseums.org.uk/artifact/sea-chart-coast-of-spain-and-portugal-included-between-cape-penas-and-gibraltar