R. W. Thomson: 3. On the Formation of Coal, and on the Changes produced in the Composition of the Strata by the Solvent Action of Water slowly percolating through the Earth’s Crust during long periods of Geological Time. In: Proceedings of the Royal Society of Edinburgh. Band8, 1875, ISSN0370-1646, S.68–69, doi:10.1017/S037016460002914X.
R. W. Thomson: 3. On the Formation of Coal, and on the Changes produced in the Composition of the Strata by the Solvent Action of Water slowly percolating through the Earth’s Crust during long periods of Geological Time. In: Proceedings of the Royal Society of Edinburgh. Band8, 1875, ISSN0370-1646, S.68–69, doi:10.1017/S037016460002914X.