PART FIVE GEOPHYSICAL AND GEOCHEMICAL 



PROSPECTING 553 



26 Seismic Prospecting, John C. Hollister and 



W. P. Hasbrouck 555 



27 Gravity and Magnetic Effects of Subsurface Bodies, 



P. A. Rodgers 585 



28 Geochemical Prospecting, Harold Bloom 621 



PART SIX DRILLING, FORMATION TESTING AND WELL 



COMPLETION 635 



29 Conventional Rock Bits, L. L. Payne 637 



30 Jet Bits, W. M. Booth and R. M. Borden 653 



31 Turbine Drilling, J. B. O'Connor 665 



32 Directional Drilling, Harry C. Kent 677 



33 Core Drilling, William M. Koch 695 



34 Applications of Coring, H. L. Landua 71 1 



35 Drilling Fluids, T. H. Dunn 715 



36 Drilling with Gas and Air, M. M. Brantly 735 



37 Special Applications of DST Pressure Data, 



C. A. Einarsen, J. P. Dolan and G. A. Hill 743 



38 Well-Completion Methods, J. E. Eckel, Chairman, 

 Mid-Continent District Study Committee on 

 Completion Practices 763 



PART SEVEN SUBSURFACE REPORTS 777 



39 Writing Scientific Reports, George W. Johnson 779 



40 Valuation and Subsurface Geology, John D. Todd 793 



PART EIGHT EXPLORATION PROGRAM 813 



41 Exploration Planning, E. A. Wendlandt 815 



Biographies 859 



Index 883 



