Principles of stratigraphy / Carl O. Dunbar [and] John Rodgers. Dunbar, Carl Owen, 1891- Rodgers, John, 1914- joint author. Geology, Stratigraphic. QE651 .D8 551.7 DUP Includes bibliographical references and index New York : Wiley, 1957. 1957. 1957 Text xii, 356 p. : eng