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- [3] U.S. deep well drilling leads worldwide activity jump Petroleum Engineer International, 1995, 67 (09):
- [6] U.S. containerboard makers gear up for string of worldwide price hikes in coming months Pulp and Paper Week, 2000, 22 (03):
- [7] U.S. drilling expenditures resume downward drift Petroleum Engineer International, 1990, 62 (07):