viii CONTRIBUTORS AND COLLABORATORS 



Chemical: CHAPTER VIII 



Leo Horvitz, Ph.D., Horvitz Research Laboratories, Houston, Texas 



Radioactivity: CHAPTER X 



Henry Faul, Ph.D., Research Associate, the Laboratory for Nuclear 

 Science and Engineering, and the Department of Geology, Massa- 

 chusetts Institute of Technology, Cambridge, Mass. 



Bore Hole Investigations: CHAPTER XI 

 Electrical Logging and Sampling: 



H, G. Doll, Ph.D., Roger Henquet, M.S., 



Maurice Martin, M.S., Andre Poupon, M.S., 



Francis Segesman, M.S., Schlumberger Well Surveying Co., 



Houston, Texas 



John C. Stick, Jr., Lane-Wells Co., Los Angeles, Calif. 



Radioactivity Logging: 



R. E. Fearon, M.S., E. S. Mardock, A.B. (Chem.), and 

 G. Swift, B.S., Well Surveys, Inc., Tulsa, Okla. 



Production Problems: CHAPTER XII 



John Jakosky, Jr., B.S., International Geophysics Co., 

 Los Angeles, Calif. 



N. van Wingen, M.S., Petroleum Technologists, Inc., 

 Montebello, Calif. 



Land Tenure^ Permit and Trespass Practices; Insurance and Patents: 



CHAPTER XIII 



Howard Painter, LL.B., and Thomas Reynolds, J.D., 



Reynolds, Painter, and Cherniss, Los Angeles, Calif. 



Weston Bourret, E.M., Kennecott Copper Corp., Pasadena, Calif. 



Insurance: 



Ralph E. Bridges, Travelers Insurance Co., Los Angeles, Calif. 



Patents : 



Herbert A. Huebner, A.B., Huebner, Beehler, Worrel, Herzig, 



and Caldwell, Los Angeles, Calif. 



Paul F. Hawley, Ph.D., Stanolind Oil and Gas Co., Tulsa, Okla. 



