Synonyme wurden verwendet für:
Bergbau
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keywords:(Bergbau)
Some notes on the bord-and-pillar system of work
Gobbin quarry and railway at the Saint-Etienne collieries
South African rope and safety-catch commission
Magmatic segregation in its relation to the genesis of certain ore-bodies
State provisions for location of lode claims
Mineral resources on Kansas City, Mexico and Orient railway
The introduction of automobiles for mining work
Comparison of horse and benzine-locomotive haulage
Mule-back transportation of sectionalized machinery