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1by Heimann, Karl Otto, 1939-
Published 1977[s.l. : s.n.], 1977[16], 158, xvi p., [13] leaves of plates (3 folded) : ill., maps ; 21 cm. -
2by Mulder, E. F. J. de
Published 1975[Utrecht : Dept. of Stratigraphy and Paleontology, State University of Utrecht, 1975]139 p. : ill. ; 24 cm.