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1. [national coal association] (8)
2. bituminous coal research, inc (5)
3. united states (4)
4. sponsored by national coal association [and] bituminous coal research, inc (2)
5. symposium on coal utilization (2)
6. symposium on underground mining (2)
7. ash utilization symposium (1)
8. bituminous coal research inc (1)
9. coal and the environment technical conference (1)
10. coal utilization symposium--focus on so₂ emission control, (1)
11. coates, neil h (1)
12. compiled by john h. faber, neil h. coates, and john d. spencer (1)
13. faber, john h (1)
14. nca/bcr coal conference and expo (1)
15. nca/bcr coal conference and expo iii (1)
16. spencer, john d (1)
17. sponsored by national coal association (1)
18. sponsored by national coal association [and] bituminous coal research inc (1)
19. sponsored by national coal association, bituminous coal research, inc (1)
20. symposium on coal mine drainage research (1)
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