CCoal-mine accidentsCoal-mine accidentsde Clarence HallMateriasCoal mine accidentsMine accidentsMine safetyEdiciones (1)Coal-mine accidents (1907)Govt. Print. Off. · inglésMás obras de Clarence HallHHeavenly PearlsHeavenly PearlsIInvestigations of fuse and miners' squibsInvestigations of fuse and miners' squibsMMagazines and thaw houses for explosivesMagazines and thaw houses for explosives
PPermissible explosives tested prior to January 1, 1911 and pPermissible explosives tested prior to January 1, 1911 and precautions to be taken in their use
TThe selection of explosives used in engineering and mining oThe selection of explosives used in engineering and mining operations
