TY - BOOK ID - 136324193 TI - Improving the performance of longwall gob gas ventholes PY - 1995 PB - Washington, DC : Bureau of Mines, U.S. Dept. of the Interior, DB - UniCat KW - Longwall mining UR - https://www.unicat.be/uniCat?func=search&query=sysid:136324193 AB - ER -