TY - BOOK ID - 6322758 TI - Coal classification PY - 1988 VL - IEACR/12 SN - 9290291621 9789290291626 PB - London : IEA (International energy agency coal research), DB - UniCat KW - 622.33 KW - Solid minerals of organic origin. Carboniferous minerals. Coals. Carbonaceous rocks KW - 622.33 Solid minerals of organic origin. Carboniferous minerals. Coals. Carbonaceous rocks UR - https://www.unicat.be/uniCat?func=search&query=sysid:6322758 AB - ER -