TOXNET (Popularity: )
http://toxnet.nlm.nih.gov/ Provides access to a cluster of databases on toxicology, hazardous chemicals, and related areas. Instruction manuals are included.
ACGIH (Popularity: )
http://www.acgih.org/ An association of health and safety professionals devoted to protecting the health of the American worker and the environment. It ...
The Health and Safety Executive (Popularity: )
http://www.hse.gov.uk/ Ensuring that risks to people's health and safety from work activities are properly controlled. Available resources, publications, and leaflets. (UK)