Book excerpt: The ever-present danger of mine fires and the possibility of hazardous atmospheric conditions in underground mines make a well-equipped mine rescue station a valuable asset to any mining district. Rescue equipment without proper maintenance provides only false security, because neglect may make apparatus unfit for use in an emergency. Promptness in fighting mine fires is important; frequently the first 30 minutes of action are worth many hours later. Likewise, the equipment will be of little value if enough men trained in its use are not readily available. This circular points out how such protection has been provided in an Arizona mining district by establishing a well-organized, adequately equipped, central mine rescue station.