282 DEEP BOREHOLE SURVEYS AND PROBLEMS 



N.P.N. National Petroleum News, Cleveland, Ohio. 



N.S.K. Neftianoe i Slantzenoe Khoziaistvo, Moscow. 



O.A. Oil Age. 



O.B. Oil Bulletin. 



O.B.Z. Osterreichische Zeitschrift. Berg-und Hlittenwesen, 



Vienna. 

 O.F.E. Oil Field Engineering, Philadelphia. 



O.G.J. Oil and Gas Journal, Tulsa, Oklahoma. 



O.V.B. Organ des Verein dor Bohrtechniker, Vienna. 



O.W. Oil Weekly, Houston, Texas. 



Pat. British Patent, London. 



P.A.G. Pan-American Geologists. 



Pet. Petroleum, Berlin. 



P.E. Petroleum Engineer. 



Proc. L.S.M.I. Proceedings of the Lake Superior Mining Institute. 

 Pr. Zt. Preussisch Zeitschrift, Berlin. 



P.T. Petroleum Times, London. 



P.W.O.A. Petroleum World and Oil Age. 



S.A.M.J. South African Mining Journal, Johannesburg. 



T.A.LM.E. Transactions of the American Institution of Mining 



Engineers, New York. 

 T.I.M.E. Transactions of the Institution of Mining Engineers, 



London. 

 T.I.M.M. Transactions of the Institution of Mining and Metallurgy, 



London. 

 U.S.B.M. Bull. Bulletin of the United States Bureau of Mines. 

 U.S.B.M.R. LTnited States Bureau of Mines Report. 



U.S.G.S. LTnited States Geological Survey, Washington. 



Z.D.G.G. Zeitschrift der deutschen geologischen Gesellschaft, 



Stuttgart. 

 Z.I.B.V. Zeitschrift des Internationalen Bohrtechniker Verbandes, 



Berlin. 

 Z.LV.B.B. Zeitschrift des Internationalen Vereines der Bohringen- 



ieure und Bohrtechniker, Vienna. 



