00323nam a2200097Ia 4500008004100000100002500041245005200066260000900118856008100127999001700208181017s9999    xx            000 0 und d  aWilliam L. Leffler  0aOil and Gas Production in Nontechnical Language  c2006  uhttps://ebookcentral.proquest.com/lib/hec-ebooks/detail.action?docID=3385185  c62424d62421