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Seller's Description:
1972. British Museum (Natural History). Softback. Book-VG. 9.5x7.5. 107pp. 9 b/w plates, some b/w illus. A detailed study of conodont extraction techniques which were applied to rock samples from Llandovery and early Wenlock strata of Wales and the Welsh Borderland. The samples yielded 11, 750 identifiable specimens, referred to 36 genera and 108 species and subspecies.
