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- [3] UNITED-STATES COMPANIES MERGING WITH FOREIGN COMPANIES WATER-ENGINEERING & MANAGEMENT, 1990, 137 (08): : 8 - 8
- [4] A RETROSPECT OF UNITED-STATES OIL INDUSTRY TAKEOVERS OF UNITED-STATES COPPER COMPANIES MATERIALS AND SOCIETY, 1991, 15 (02): : 89 - 107