Scheidegger, Adrian E., 1925- Lithologic variations in slope development theory. - Washington, 1964. - iii, 8 p. diagrs., tables. 26cm. Bibliography: p. 8. LCCN: gs 64000284 Subjects--Topical Terms: Slopes (Physical geography)Erosion. LC Class. No.: QE75 / .C5 no. 485