Heiken, Grant. An atlas of volcanic ash. - Washington Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.] 1974. - iv, 101 p. illus. 26 cm. - Smithsonian contributions to the earth sciences no. 12 . 921004 Bibliography: p. 13-14. LCCN: 73013519 //r89 Subjects--Topical Terms: Volcanic ash, tuff, etc. LC Class. No.: QE1 QE461 / .S227 no. 12 Dewey Class. No.: 552/.2