Clarke, I. E., Art and Industry, pt. 2, pp. 1253-1260.
—— WILLIAM BULLOCK. Correlation papers. Eocene. Washington, 1891. 173pp., 2 pls.
U.S. Geol. Survey: Bulletin no. 83.
CLARKE, FRANK WIGGLESWORTH. Report of work done in the division of chemistry and physics mainly during the fiscal year 1889-'90. Washington, 1891. 131pp. .15
U.S. Geol. Survey: Bulletin no. 78.
—— The relative abundance of the chemical elements. 9pp.
U.S. Geol. Survey; Bulletin no. 78, pp. 34-42.
—— W., and SCHNEIDER, E. A. Experiments upon the constitution of the natural silicates. 23pp.
U.S. Geol. Survey: Bulletin no. 78, pp. 11-33.
