BIOME offers free access to a searchable catalog of Internet sites and resources covering the health and life sciences...

A collection of more than "20,000 descriptions of Earth science data sets and services covering all aspects of Earth and environmental sciences...

A classified source listing for greylit ("Information produced on all levels of government, academics, business and industry in electronic and print formats not controlled by commercial publishing i...

Directory to high-quality web resources in medicine and allied health sciences, veterinary medicine, biology, natural history, agriculture and forestry, bioethics, history of medicine, and related disciplines...

"A broad, collaborative program to provide increased access to data and information on the nation's biological resources; the NBII links diverse, high-quality biological databases, information products, and analytical tools maintained by NBII partners and other contributors in government agencies, academic institutions, non-government organizations, and private industry...

A "gateway to authoritative selected science information provided by U...

Provides links to general and specific resources, discussion groups, and tutorials...

Well-done site with numerous links to other websites that deal with soil...