1. See Science, 211:806 (1981).
2. J.A. Michener, “The Covenant,” Random House, New York (1980).
3. From “Earthquake Country,” Lane Books, Menlo Park, New York, 105 (1971).
4. Pottery by Glen Lukens, illustrated in Creative Horizons, 28:24 (1968).
5. V.F. Bignell, Mat’ls. in Eng. Appl., 1:310 (1979).