00550nam a2200145Ia 4500008004100000010001300041040001700054082002300071100002400094245009900118260004300217300001600260440003800276650009000314190328s9999||||xx |||||||||||||| ||und||  a57-10154  aNITILcNITIL  221sta665.55bZ73C  aZimmermann, Erich W 0aConservation in the production of petroleumba study in industrial controlcErich W Zimmermann  aNew HavenbYale University Pressc1957  axxii, 417p.  aPetroleum monograph series; vol 2  aPetroleum conservation; Petroleum products; Petroleum industry and trade; Natural gas