The Natural History of Coal (Classic Reprint)

In the past it would seem that the root of Our difficulties in regard to agreement on such points has been the initial hypothesis, that all coals, or at least all the coals of the Carboniferous period, were derived from the same type of mother substance, accumulated under the same conditions, and converted by the same means. It is quite clear that such an assumption is entirely false. There was no one original mother substance, no one original mode of...