Contains
- wood coal
Intermediate between peat and bituminous coal.
- peat
Partially carbonized vegetable matter saturated with water; can be used as a fuel when dri...
- humic shale
Shale that is rich in humic acids.
Intermediate between peat and bituminous coal.
Partially carbonized vegetable matter saturated with water; can be used as a fuel when dri...
Shale that is rich in humic acids.