Dunbar, Carl O. 1891- Principles of stratigraphy / [by] Carl O. Dunbar [and] John Rodgers. - New York: John Wiley & Sons, [1961]. - xii, 356 p. : ill., maps, tables ; 26 cm. Includes bibliographical references (p. 319-339) and index (p. 341-356). Subjects--Topical Terms: Geology, Stratigraphic Dewey Class. No.: 551.7