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Abstract
Staff at the National Library of Medicine create Internet subject guides that direct users to reliable sites on environmental health topics and provide pre-formulated searches of the National Library of Medicine's toxicology and environmental health databases. Criteria were developed to evaluate Web sites for authority, content, intended audience, and technical reliability. Searches are created using the most appropriate subject headings and keywords and can be limited to the most recent five years or to review articles only. Thirteen subject guides have been produced covering lead, arsenic, chemical and biological warfare, environmental justice, toxicogenomics, dietary supplements, and pesticides. Future topics include mercury and hazards from art materials.