Gass, I.G., ed. UNDERSTANDING the earth: a reader in the earth sciences / edited by I.G.Gass, Peter J.Smith, R.C.L.Wilson - 2nd ed. - Sussex Open university press 1972 - 383 p. Includes glossary and index. ISBN: 44867 Subjects--Topical Terms: Earth scienceEncyclopedias and dictionaries Dewey Class. No.: 550 / UND