Gabler, Robert E. Essentials of physical geography / Robert E. Gabler, Robert J. Sager, Daniel L. Wiss. - 4th ed. - Philadelphia : Saunders College Pub., c1991. - xv, 559p. : col. ill. ; 25 cm. Glossary : p. G543 - G559. Includes index. ISBN: 0030353041 Subjects--Topical Terms: Physical geography LC Class. No.: GB54.5 / G11 1991