CONTRIBUTORS AND COLLABORATORS 



Second Edition 



Introduction: CHAPTER I 



Helen Murphy, B.A., Los Angeles, Calif. 



Katharine Jakosky, B.A., Los Angeles, Calif. 



Blakemore Thomas, Ph.D., University of Kansas, Lawrence, Kans. 



Howard Pyle, M.S., Continental Southern Oil Co., Los Angeles, Calif. 



Geologic and Economic Background: CHAPTER H 



Clyde H. Wilson, M.S., International Geophysics, Los Angeles, Calif. 

 Dart Wantland, M.S., U.S. Bureau of Reclamation, Denver, Colo. 



Magnetic: CHAPTER HI 



Dart Wantland, M.S., U.S. Bureau of Reclamation, Denver, Colo. 



Airplane Operations: 



E. A. EcKHARDT, Ph.D., Gulf Research and Development Corp., 

 Pittsburgh, Pa. 



Helicopter Operations : 



Hans Lundberg, Sc.D., Lundberg Explorations, Ltd., 

 Toronto, Ontario 



Gravity: CHAPTER IV 



Dart Wantland, M.S., U.S. Bureau of Reclamation, Denver, Colo. 



Gulf Vndertvater Gravimeter: 



E. A. Eckhardt, Ph.D., Gulf Research and Development Corp., 

 Pittsburgh, Pa. 



Diving Bell: 



Eugene W. Frov/e, M.S., Robert H. Ray Co., Houston, Texas 



Terrestrial Photogrammetric Mapping: 



W. O. Bazhaw, B.S., Republic Exploration Co., Tulsa, Okla. 



