UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF MINES
MINE HOIST ELECTRICAL SYSTEMS STUDY - SPRINGFIELD N.T.I.S - 29X23 - REPORT NO.83-86 PB 86-235132 .
622.6 U58
MINE HOIST ELECTRICAL SYSTEMS STUDY - SPRINGFIELD N.T.I.S - 29X23 - REPORT NO.83-86 PB 86-235132 .
622.6 U58