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Since 1997, the Natural Sciences database has grown into a collection of over 170,000 high-quality web sites, related to environmental, aquatic, and biomedical topics, that are hand-picked and indexed by our editors. We choose only sites containing specific, technical information of interest to a college-level audience, from respected, nonbiased sources such as educational institutions, government agencies, and scientific organizations. We review all links on a regular basis, and average a phenomenal rate of less than 5% deadlinks.

Subject Coverage
    Major areas of coverage include:
    • Agriculture, Forestry, and Botany
    • Aquatic Sciences (including Water Resources & Oceanography)
    • Biotechnology
    • Conservation and Biodiversity
    • Earth Sciences and Atmospheric Sciences
    • Ecology and Ecosystems
    • General Biology
    • Genetics and Molecular Biology
    • Geosciences
    • Hazardous Waste
    • Human Population and the Environment
    • Physical Education
    • Pollution
    • Risk and Safety (including Toxicology)
    • Sustainability Sciences
Web Site Selection
    -Web sites must originate from a reputable source.
    -Web sites must provide direct access to information.
    -Editors do not include sites that are ephemeral.
    -Editors avoid sites with an obvious political agenda.
Update Frequency
    Daily updates with an average annual growth of 8%
Size & Statistics
    Cambridge Scientific Abstracts
    7200 Wisconsin Avenue
    Bethesda, Maryland 20814-4823 USA

    Voice: 800-843-7751 (in North America)
    Voice: +1 301-961-6700 (Worldwide)
    Fax: +1 301-961-6720