Longwall-shortwall mining, state of the art /

I tiakina i:
Ngā taipitopito rārangi puna kōrero
Ngā kaituhi rangatōpū: American Institute of Mining, Metallurgical, and Petroleum Engineers, Society of Mining Engineers of AIME
Ētahi atu kaituhi: Ramani, R. V.
Hōputu: Pukapuka
Reo:Ingarihi
I whakaputaina: New York, NY. : Society of Mining Engineers of The American Institute of Mining, Metallurgical, and Petroleum Engineers, 1981.
Ngā marau:
Longwall mining.
Longwall mining
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