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- [4] COAL AND CANADA-UNITED-STATES ENERGY RELATIONS - GORDON,RL JOURNAL OF ENERGY AND DEVELOPMENT, 1978, 3 (02): : 439 - 441
- [6] LIGNITE AND COAL IN THE UNITED-STATES ENERGY FUTURE INDUSTRIAL & ENGINEERING CHEMISTRY PRODUCT RESEARCH AND DEVELOPMENT, 1979, 18 (04): : 314 - 317
- [10] JAPANESE DEMAND FOR UNITED-STATES COAL - MARKET-SHARE MODEL QUARTERLY REVIEW OF ECONOMICS AND BUSINESS, 1976, 16 (03): : 51 - 60