Encyclopedia of earth and physical sciences : Silurian period - Time / - New York : Marshall Cavendish, c1998. - 11 v. (1584 p.) :[V-9] col. ill. 31 cm. Includes bibliographical references and index. ISBN: 0761405518 (set) Subjects--Topical Terms: Earth sciences;Physical sciences--Encyclopedias.;Encyclopedias. Dewey Class. No.: 500.203 / ENC 1998