Table 1.
Coal samples of different ranks used in this study.
| Sample ID | Coal source | State | ASTM rank | Collection year |
|---|---|---|---|---|
| Lignite | Beulah-Zap | North Dakota | Lignite | 1986 |
| SubC | Flowers-Goodale | Montana | Subbituminous C | 2013 |
| SubB | Wyodak Anderson | Wyoming | Subbituminous B | 1985 |
| HV bit (Pittsburgh) | Pittsburgh #8 | Pennsylvania | High Volatile Bituminous | 1986 |
| HV bit (Stockton) | Lewiston-Stockton | West Virginia | High Volatile Bituminous | 1986 |
| LV bit | Pocahontas #3 | Virginia | Low Volatile Bituminous | 1986 |
Sample locations and collection dates from Vorres (1990).