Kolenkow, Robert J. Physical geography today; a portrait of a planet. Principal contributor: Robert J. Kolenkow. Contributors: Reid A. Bryson [and others] Principal academic advisor: Robert A. Muller. - Del Mar, Calif., CRM Books [1974] - ix, 518 p. illus. 27 cm. Bibliography: p. 482-485. ISBN: 0876651724 LCCN: 73086479 Subjects--Topical Terms: Physical geography. LC Class. No.: GB 55 .K64 1974 / .K64 Dewey Class. No.: 910/.02