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• Precautions to be observed in entering abandoned exploratory shafts and pits
• Rock strata gases in mines of the East Tintic mining district, Utah
• Use of Vacutainers for collection of mine atmosphere samples
• A statistical determination of spark ignition safety factors in methane, propane, and ethylene mixtures in air
• Probability of resistive spark ignition caused by very low currents
• Probability of spark ignition in intrinsically safe circuits