1. Clarke, jun., Roy S., Jarosewich, E., Mason, B., Nelen, J., Gómez, M., and Hyde, J., Smithsonian Contributions to the Earth Sciences, No. 5, 53 (1971).
2. Wiik, H. B., Geochim. Cosmochim. Acta, 9, 279 (1956).
3. Krouse, H. R., and Modzeleski, V. E., Geochim. Cosmochim. Acta, 34, 459 (1970).
4. Pouchert, C. J., Aldrich Library of Infrared Spectra Spectrum, 214A (Aldrich Chemical Co., Milwaukee, 1970).
5. Walker, J. F., Formaldehyde (Reinhold, New York, 1964).