http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Analysis of injuries involving jackleg rock drills underground, 1973-1974
Injuries involving jackleg rock drills underground, 1973-1974
Mining Enforcement and Safety Administration.
Informational report (United States. Mining Enforcement and Safety Administration) ; IR1024