. Bulletin of the British Museum (Natural History), Geology. THE LIAS SIC AMMONITE ZONES AND SUBZONES OF THE NORTH-WEST EUROPEAN PROVINCE BY WILLIAM THORNTON DEAN, DESMOND THOMAS DONOVAN and MICHAEL KINGSLEY HOWARTH Pp- 435-505 ; Plates 63-75. BULLETIN OF THE BRITISH MUSEUM (NATURAL HISTORY) GEOLOGY Vol. 4 No. 10 LONDON: 1961. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)

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