» Outlines of geology: a combination of Outlines of physical geology [2d ed.], by Chester R. Longwell, Adolph Knopf, and Richard F. Flint and Outlines of historical geology [4th ed.], by Charles Schuchert and Carl O. Dunbar
Outlines of geology: a combination of Outlines of physical geology [2d ed.], by Chester R. Longwell, Adolph Knopf, and Richard F. Flint and Outlines of historical geology [4th ed.], by Charles Schuchert and Carl O. Dunbar