General

EurekAlert: http://www.eurekalert.org

Internet Public Library Directory - Science: www.ipl.org/div/subject/browse/sci00.00.00/

National Science Digital Library: http://nsdl.org

The Physics Classroom - Physics Tutorial: http://www.physicsclassroom.com/Default2.html

Science.gov: http://www.science.gov

Scirus: http://www.scirus.com

 Biology

Animal Diversity Web: http://animaldiversity.ummz.umich.edu/site/index.html

National Center for Biotechnology Information: http://www.ncbi.nlm.nih.gov

National Health Museum - Biology Websites: http://www.accessexcellence.org/RC/biology.html

Tree of Life Web Project: http://tolweb.org/tree/phylogeny.html

WWW Virtual Library - Biosciences: http://www.vlib.org/Biosciences.html
 

 Chemistry

Chemfinder: http://chemfinder.cambridgesoft.com

ChemWeb: http://www.chemweb.com

Molecule of the Month: http://www.chm.bris.ac.uk/motm/motm.htm

NIST Chemistry Webbook: http://webbook.nist.gov/chemistry

Web Elements - Periodic Table: http://www.webelements.com
 

 Environmental Science

Environmental Media Services: http://www.ems.org

National Library of the Environment: http://www.ncseonline.org/NLE

U.S. Environmental Protection Agency: http://www.epa.gov

World Resources Institute: http://www.wri.org

 Geology

Links for Mineralogists: http://www.uni-wuerzburg.de/mineralogie/links.html

Minerals Information: http://minerals.usgs.gov/minerals

National Map: The Nation's Topographic Map for the 21st Century: http://nationalmap.usgs.gov

U.S. Geological Survey: http://www.usgs.gov
 

 Physics & Astronomy

Astroweb - Astronomy / Astrophysics on the Web: http://www.vilspa.esa.es/astroweb/astronomy.html

Energy Citations Database: http://www.osti.gov/energycitations

Information Bridge: http://www.osti.gov/bridge

NASA - Astrophysics Data System: http://adswww.harvard.edu

NASA - National Aeronautics and Space Administration: http://www.nasa.gov

Physics Reference Data: http://physics.nist.gov/PhysRefData/contents.html

Physics Web: http://physicsweb.org

PhysLink: http://www.physlink.com

WWW Virtual Library - Physics: http://vlib.org/Physics

Internet Directory