Hydrodynamics of Oil and Gas, by Ian Lerche and Rene O. Thomsen, ISBN o-306-44872-6. Plenum Press, New York, 1994.308 p., with an attached a DOS formatted double density disk containing the ASCII text source code and script used in the text. $75. Petroleum Geochemistry and Geology, Second Edition, by John M. Hunt, ISBN O-7167-2441-3. W. H. Freeman and Company, New York, NY, 1996.743 p. $59.95.