TY - BOOK ID - 136302200 TI - Drilling and dustiness of metal-mine air AU - Harrington, D. AU - United States. PY - 1922 PB - [Washington, D.C.] : U.S. Department of the Interior, Bureau of Mines, DB - UniCat KW - Mine ventilation. KW - Mine dusts. KW - Boring. UR - https://www.unicat.be/uniCat?func=search&query=sysid:136302200 AB - ER -