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2. The occurrence of minor elements in ash of low-rank coal from Texas, Colorado, North Dakota and South Dakota
3. Off the main lines : a photographic odyssey
4. [Official letters of the Secretary of the Territory].
5. Officially selected cases argued and determined in the Court of Appeals of the state of Colorado
6. Oil Shale Claims Act of 1990
7. Oil Shale Claims Act of 1990
8. Oil shale in Northwestern Colorado and adjacent areas
9. Oil shale, tar sands, and related materials
10. Old Spanish Trail
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