Five-Billion-Year Clock, Patrick M. Hurley, Saturday Evening Post, 234: 26 (March 18, 1961).
Geologic Time Scale, J. Laurence Kulp, Science, 133: 1105 (April 14, 1961).
Geology, Reginald A. Daly, Scientific American, 183: 36 (September 1950).
Tracks of Charged Particles in Solids, R. L. Fleischer, P. B. Price, and R. M. Walker, Science, 149: 383 (July 23, 1965).
How Old Is It?, Lyman J. Briggs and Kenneth F. Weaver, National Geographic Magazine, 114: 234 (August 1958).
Moving Picture of the Last Ice Age, Richard Foster Flint, Natural History, 66: 188 (April 1957).
Modern Methods for Measurement of Geologic Time, E. J. Zeller, Mineral Information Service, 18: 9 (January 1965). Single copies are $0.10 from Division of Mines and Geology, Ferry-Building, San Francisco, California 94111.
Fluted Projectile Points: Their Age and Dispersion, C. Vance Haynes, Jr., Science, 145: 1408 (September 25, 1964).
Unraveling the Age of Earth and Man, E. L. Simons, Natural History, 76: 52 (February 1967).
Radiocarbon Dating and Archeology in North America, F. Johnson, Science, 155: 165 (January 13, 1967).