Physics and Science Reference by PhysLINK.com
Physics, astronomy and greneral science reference, physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical ...
www.physlink.com/Reference/Index.cfm

Biology Online. Life Science Reference
Biology Online, information in the life sciences in the form of tutorials, references and an online dictionary of biology terms.
www.biology-online.org/

Science Reference Services (Library of Congress)
Science Reference Services, located on the fifth floor of the John Adams Building of the Library of Congress, is the principal location for research in the ...
www.loc.gov/rr/scitech/

Science Reference Shelf
Science Reference Shelf. Constants. Favorite Mathematical Constants -Steve Finch, MathSoft. Recommended! Physics/Astronomy Constants- Chris Dolan, ...
newton.physics.wwu.edu:8082/jstewart/scied/sciref.html

Martindale's 'The Reference Desk' - International Art, Business ...
Large collection of links to reference resources, including language centers, calculators, maps, and science tables.
www.martindalecenter.com/

history of science science studies reference sources
gort.ucsd.edu/ds/initial.html