Tilling, Robert I. Volcanoes / [electronic resource] / by Robert I. Tilling.. — Alexandria, VA : [Washington, D.C. : : U.S. Dept. of the Interior, Geological Survey ; : Supt. of Docs., U.S. G.P.O., distributor,, 1987]. — 45 p. : : ill. (some col.), maps ; 24 cm.

Includes bibliographical references (p. 44).



Subjects--Topical Terms:
Volcanoes.