Dalzell, Robert S.
Remedial and strata replacement technique on longwall faces Dalzell, Robert S. - Washington Bureau of mines 1985
MINERIA
ESTRATIFICACION
POZOS PROFUNDOS
622:551.3.051.8
Remedial and strata replacement technique on longwall faces Dalzell, Robert S. - Washington Bureau of mines 1985
MINERIA
ESTRATIFICACION
POZOS PROFUNDOS
622:551.3.051.8