| Regions | ||||
| 1 | Rhode Island Meta-anthracite | 13 | Black Hills | |
| 2 | Pennsylvania Anthracite | 14 | North Central | |
| 3 | Atlantic Coast | 15 | Tertiary Lake Beds | |
| 4 | Appalachian | 16 | Bighorn Basin | |
| 5 | Northern | 17 | Wind River | |
| 6 | Eastern | 18 | Hams Fork | |
| 7 | Western | 19 | Uinta | |
| 8 | Southwestern | 20 | Southwestern Utah | |
| 9 | Mississippi | 21 | San Juan River | |
| 10 | Texas | 22 | Raton Mesa | |
| 11 | Fort Union | 23 | Denver | |
| 12 | Powder River | 24 | Green River | |
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Last updated 01 April 2004