The Distribution and Properties of British Coals
JSGT 1937 V21 T196-T214
The coalfields of Great Britain contain all the important types of coal, with the exception of lignite, but these can be defined only approximately in terms of the coalfield, since some fields show a wide variety of types. The Fuel Research Survey is steadily compiling data regarding the important seams and also commercial grades. The seam sections are taken by a special technique, and the results of analysis can be graphed over the entire field to show the trend of variations.
J. G. King