Author: Whittington, H. B.
Title: A monograph of the Ordovician trilobites of the Bala Area, Merioneth. Parts I-IV (complete).
Description: London, The Paleontographical Society, 1962-1968. Four parts in four. 4to. 138 pp. 32 plates. Original wrappers with printed paper label on front wrappers (parts I-III), and original printed wrappers (part IV). = The complete monograph, being the series no's 497, 504, 512 and 520. A major revision with new species. Well-illustrated. Former private owner's name in the top margin of the first part; cancelled stamp on the front wrappers of the third and fourth part; otherwise an excellent, internally unmarked and clean set.

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