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HEALTH AND SAFETY RESEARCH AND TESTING CENTER
BUREAU OF MINES
4800 FORBES AVENUE
PITTSBURGH, PENNSYLVANIA 15213
ANALYSES OF AIR SAMPLES
Frick District
PERCENT BY VOLUME
CUBIC FEET
CARBON DIOXIDE
OXYGEN METHANE
CARBON MONOXIDE
NITROGEN
AIR PER MINUTE
METHANE IN
24 HOURS