Contents include an introduction on health professionals & other user communities, public health impacts of hazardous substances, & changing trends in health practice; the National Library of Medicine's Toxicology & Environmental Health Information Program, Division of Specialized Information Services, & TEHIP Databases; other toxicology & environmental health information resources. Also, understanding the information needs of health professionals; increasing awareness: training & outreach; accessing & navigating the TEHIP databases; program issues & future directions; glossary & acronyms.