Walker, Sydney F.
Electricity in mining - New York D. Van Nostrand Company 1907 - 385 p. ilus., láms.
ELECTRICIDAD
INSTALACIONES ELECTRICAS
MINERIA
A/622.48/W19
Electricity in mining - New York D. Van Nostrand Company 1907 - 385 p. ilus., láms.
ELECTRICIDAD
INSTALACIONES ELECTRICAS
MINERIA
A/622.48/W19