1. Dinneen, G. U., Van Meter, R. A., Smith, J. R., Bailey, C. W., Cook, G. L., Allbright, C. S., and Ball, J. S., Bureau of Mines Bull., 593 (1961); and other work of same authors.
2. Meinschein, W. G., Science, 145, 262 (1964).
3. Lochte, H. L., and Meyer, H. W. N., J. Amer. Chem. Soc., 78, 2150 (1956).
4. Burlingame, A. L., Haug, P., Schnoes, H. K., and Slmoneit, B. R., in Advances in Organic Geochemistry 1968 (edit. by Schenck, P. A., and Havenaar, I.), 85 (Pergamon, Braunschweig, 1969).
5. Burlingame, A. L., in Advances in Mass Spectrometry, 4 (edit. by Kendrick, E.), 15 (The Institute of Petroleum, London, 1968).