Thomas: Legislative Information on the Internet
Produced by the U.S. Library of Congress (LOC).

Source: U.S. Library of Congress
Access: Free to all users.
Coverage: 1967 - present (limited coverage prior to 1975)
Updated: Weekly
Vocabulary: Bill Number, Congress Number, Keyword
Description: Thomas provides full-text access to U.S. federal laws, bills, treaties, appropriation, and presidential nominations. Coverage starts with the 90th U.S. Congress.

ThomCat, the TJU Online Catalog
Produced by Thomas Jefferson University.

Source: Thomas Jefferson University
Access: Free to all users.
Coverage: 1484 - present (both archival and modern books are included in this database)
Updated: Daily
Vocabulary: MeSH: Medical Subject Headings
Description: ThomCat, the online catalog of Jefferson's Scott Memorial Library, includes bibliographic and holdings information for the library's collection of books, journals, multimedia and archival materials.

TOXLINE
Produced by the U.S. National Library of Medicine (NLM).

Source: National Library of Medicine
Access: Free to all users.
Coverage: 1900 - present
Updated: Not stated
Vocabulary: Keyword
Description: The TOXLINE® database is the National Library of Medicine's bibliographic database for toxicology, a varied science encompassing many disciplines. TOXLINE records provide bibliographic information covering the biochemical, pharmacological, physiological, and toxicological effects of drugs and other chemicals. It contains more than 3 million bibliographic citations, most with abstracts and/or indexing terms and CAS Registry Numbers. TOXLINE references are drawn from various sources grouped into two parts--TOXLINE Core and TOXLINE Special. A standard search of TOXLINE retrieves records from both subsets. Users can also limit retrieval to only one.

TOXNET: Toxicology Data Network (including TOXLINE)
Produced by the U.S. National Library of Medicine (NLM).

Source: NLM
Access: Free to all users.
Coverage: Varies by database, oldest covers 1950 - present
Updated: Varies by database
Vocabulary: Keyword
Description: TOXNET is a multidatabase system of information for literature and data on toxicology, hazardous chemicals and related areas. Includes teratology, chemical carcinogens, mutagenicity and environmental toxicity. It is compiled by participating U.S. government agencies

TRIP Database
Produced by TRIP Database, Ltd..

Source: TRIP Database, Ltd.
Access: Free to all users.
Coverage: Varies by source, oldest (PubMed) covers 1860s - present
Updated: Monthly
Vocabulary: Keyword
Description: TRIP is a UK-based website that helps answer clinical questions by providing a simultaneous search of over 50 sources of evidence-based information. It categorizes results into five categories: evidence-based synopses, clinical answers, systematic reviews, guidelines, eTextbooks, clinical calculators, and custom-filtered MEDLINE. Results are ordered based on a score comprised of year of publication, term position/density, and a rating of the publication's methodological quality and clinical usefulness. The site allows advertising, but states a commitment to a policy of independence from all external sources.

TRIS: Transportation Research Information Service
Produced by the Transportation Research Board, U.S. Department of Transportation.

Source: U.S. National Transportation Library
Access: Free to all users.
Coverage: 1920 - present (varies by type of material)
Updated: Not stated
Vocabulary: Transportation Research Thesaurus
Description: The TRIS Online database contains over half a million records of published transportation research including technical reports, books, conference proceedings and journal articles. TRIS coverage includes the disciplines of planning, finance, design and construction, materials, environmental issues, safety and human factors and operations for the modes of highways, transit, railroads, maritime and aviation. TRIS does not contain information on vehicle standards and specifications, patent information, market research, military transport or news articles. TRIS focuses on transportation research.