X PREFACE AND ACKNOWLEDGMENTS 



COLLABORATORS AND CRITICS (First Edition) 



Geologic and Economic Background of Exploration Geophysics : 



C. H, Wilson, M.S., International Geophysics Oil Co., Inc., Los Angeles, 



California. 

 H. W. Hoots, Ph.D., Consultant, Los Angeles, California. 

 Howard C. Pyle, M.S., Continental Southern, Los Angeles, California. 



Magnetic : 



C. H. Wilson, M.S., International Geophysics, Inc., Los Angeles, 



California. 

 Noel H. Stearn, Ph.D., W. C. McBride, Inc., St. Louis, Missouri. 

 V. G. Gabriel, Consultant, Sc.D., Los Angeles, California. 



Gravity : 



W. M. Rust, Jr., Ph.D., Humble Oil and Refining Co., Houston, 



Texas. 

 L. M. Mott-Smith, Ph.D., General Geophysical Co., Houston, Texas. 

 Paul Weaver, Gulf Oil Corporation, Houston, Texas. 

 L. F. Athy, Ph.D., Continental Oil Co., Ponca City, Oklahoma. 

 E. V. McCollum, M.S., E. V. McCollum and Co., Tulsa, Okla. 

 Donald C. Barton, Ph.D., Humble Oil and Ref. Co., Houston, Texas. 

 V. G. Gabriel, Sc.D., Los Angeles, California. 



Seismic : 



M. B. Widess, Ph.D., Standard Oil Co. of Indiana, Tulsa, Okla. 



W. M. Rust, Jr., Ph.D., Humble Oil and Refining Co., Houston, 



Texas. 

 Beno Gutenberg, Ph.D., Professor of Geophysics, California Institute 



of Technology, Los Angeles, California. 

 L. F. Athy, Ph.D., Continental Oil Company, Ponca City, Oklahoma. 

 Henry Salvatori, M.S., Western Geophysical Company, Los Angeles, 



California. 

 N. A. Haskell, Ph.D., U. S. Smelting, Refining, and Manufacturing 



Co., Boston, Mass. 

 Frank Rieber, B.Sc, Frank Rieber, Inc., Los Angeles, California. 

 Wm. Miller, Miller Corporation, Pasadena, California. 



Explosives : 



A. R. Ely, B.Sc, in collaboration with A. E. Forster, E.M., H. E. Nash, 

 B.Sc, and J. M. Martin, B.Sc, Hercules Powder Company, Wil- 

 mington, Delaware. 



Drilling Exploration : 



J. A. Noyes, S.B., Joy Manufacturing Co., Dallas, Texas. 



