TY  - BOOK
AU  - Krevelen,D.W.van
TI  - Coal: typology, chemistry, physics, constitution 
SN  - 0444419705
PY  - 1981///
CY  - Amsterdam
PB  - Elsevier Science
KW  - Coal
N1  - Includes index; Bibliography : p. 495-496
ER  -