TY - BOOK ID - 135829355 TI - Re-issue of P07-20 : change to respirable dust data card-addition of pre-weight date. PY - 2011 PB - [Arlington, Va.] : [U.S. Dept. of Labor, Mine Safety and Health Administration], DB - UniCat KW - Mine safety KW - Mine dusts KW - Coal mines and mining KW - Dust control UR - https://www.unicat.be/uniCat?func=search&query=sysid:135829355 AB - ER -