939 resultados para Sulphur mines and mining
Resumo:
"Appointed to inquire into the causes of the present dearness and scarcity of coal."
Resumo:
Mode of access: Internet.
Resumo:
"Specially compiled and prepared for the convenient use of mine officials, mining engineers, and students preparing themselves for certificates of competency as mine inspectors or mine foremen."
Resumo:
"Report of the United States Bureau of Mines to the Pennsylvania State Anthracite Mine Cave Commission and review of the compressive strength of anthracite, bituminous coals and mine supports."