TY - GEN digital ID - 139449765 TI - Coal quality : global priorities : international conference : U.S. Geological Servey Reston, Virginia : September 24-26, 2001 PY - 2004 SN - 0607987170 PB - Reston, Virginia US Department of the Interior, Geological Survey National Center DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:139449765 AB - ER -