01021cam a22002771 4500 gs 37000222 DLC 20260227111342.0 770622s1937 xx ab 000 0 eng c gs 37000222 (OCoLC)3060069 U.S. Geol. survey. Library UU OCoLC DLC premarc QE621 .T75 541 Tromp. Solco Walle. On the mechanism of the geological undulation phenomena in general and of folding in particular and their application to the problem of the "Roots of mountains" theory, by Dr. S.W. Tromp. Leiden. A.W. Sijthoff's uitgeversmaatschappij N.V., 1937. 3p. l., 184 p. incl. illus., maps. diagrs. 25 cm. "List of publications": p. 172-184. Mountains. Folds (Geology) Geology, Structural. The Mechanism of the geological undulation phenomena. The "Roots of mountains" theory. 27372 27372