Occupational Safety & Health Administration – osha.gov

Army Corps of Engineers EM 385-1-1 – http://www.usace.army.mil/SafetyandOccupationalHealth/SafetyandHealthRequirementsManual.aspx

NIOSH – http://www.cdc.gov/niosh/

ACGIH – http://www.acgih.org/

ASSE – http://www.asse.org/

BCSP – http://www.bcsp.org/