Clarke, Frank Wigglesworth, 1847-1931 The constitution of the natural silicates / by Frank Wigglesworth Clarke. - Washington, Govt. Print. Off., 1914. - 128 p. ; 24 cm. - U.S. Geological survey. Bulletin 588 . - United States. Geological Survey. Bulletin ; 588. . Includes index. LCCN: gs 14000782 Subjects--Topical Terms: Silicates. LC Class. No.: QE75 / .B9 no. 588