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- [23] Helicopter sales buoyed by strong economies AVIATION WEEK & SPACE TECHNOLOGY, 1997, 146 (05): : 54 - 56
- [24] HELICOPTER SALES TIED TO ENERGY MARKET AVIATION WEEK & SPACE TECHNOLOGY, 1983, 119 (14): : 63 - &
- [25] SOVIETS LOOK WEST FOR HELICOPTER SALES AVIATION WEEK & SPACE TECHNOLOGY, 1984, 121 (11): : 30 - &