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- [21] Wizard U.K. Astor bid based on U.S. upgrade Aviation Week and Space Technology (New York), 1998, 149 (06):
- [28] U.S. utility expenditures remain near $6 billion for 1995 1600, (Advanstar Communications, Inc, Duluth, MN, USA):
- [29] Upgrade of U.S. steel's gary works slab handling facilities Iron and Steel Engineer, 1993, 70 (09):