"Tidal Chart of the British Isles Showing the Progress of the Wave of High Water ..." engraved by W. & A.K. Johnston, published by William Blackwood & Sons in Johnston's Physical Atlas of Natural Phenomena, 1850. Steel engraved map with original hand colour, on thick paper. Slight foxing, plate mark and wide margins. Size 26.5 x 20.5 cms. Ref F719
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