Umbgrove, J. H. F. The pulse of the earth - 2nd ed. - The Hague Martinus Nijhoff 1947 - xxii, 258p, [11]p. Illustration 25cm x 17.5cm 8 plates, 2 tabels Subjects--Topical Terms: GeologyEarth (Planet) Structural geologyEarth movement GeophysicsGeography Dewey Class. No.: 550 / UMB