Evolutionary trends in Foraminifera : a collection of papers dedicated to I.M. van der Vlerk on the occasion of his 70th birthday / G.H.R. von Koenigswald Koenigswald, G. H. R. von (Gustav Heinrich Ralph), 1902-1982, ed. Vlerk, I. M. van der (Isaäk Martinus), 1892- Foraminifera, Fossil. QE772 .K6 563.1 VOE Includes bibliographical references and index Amsterdam : Elsevier Pub. Co., 1963. 1963. 1963 Text 355 p. : eng