On the four visible ingredients in banded bituminous coal; studies in the composition of coal, No. 1
- 15 May 1919
- journal article
- Published by The Royal Society in Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character
- Vol. 90 (633) , 470-487
- https://doi.org/10.1098/rspb.1919.0006