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Super stopping a permanent solid stopping for directing ventilation airflows in large-opening metal/nonmetal mines.

Bibliographic Details
Corporate Author: Pittsburgh Research Laboratory (National Institute for Occupational Safety and Health)
Format: Government Document Online Book
Language:English
Published: [Pittsburgh, PA] : U.S. Dept. of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, [2006]
Series:Technology news ; no. 518
DHHS (NIOSH) publication ; no. 2006-134
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Online Access:ONLINE VERSION
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