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Rare alkali elements in trilobites

By McKerrow, W.S. . . 504-516pp.

London Pergamon press ltd 1959 . viii, 464p 25cm x 15.5cm.

London Pregmon press 1961 . v, 317p. 25cm x 15cm.

New York Pergamon press 1964 . [4],398p. 25.5cm x 16cm.

By Hamilton, E. I.. London Academic press 1965 . xiv,[1], 267p. 23cm x 15cm .

By Ahrens, L. H.. London Addison-wesley publishing company 1961 . xxiii, 454p. 23cm x 15cm.