2. halperinp, exposure
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http://www.osha.gov/dts/hib/hib_data/hib19960605.htmlhttp://www.osha.gov/dts/hib/hib_data/hib19960605.htmlhttp://www.epa.gov/ozone/snap/fire/co2/co2report.pdfhttp://www.cdc.gov/niosh/rtecs/ff61a800.htmlhttp://www.cdc.gov/niosh/rtecs/ff61a800.htmlhttp://cdiac.esd.ornl.gov/trends/co2/sio-mlo.htmmailto:[email protected]