Library Directory - Online Science Libraries

Physics Libraries

http://www.hq.nasa.gov/office/hqlibrary/
http://bulletphysics.org/wordpress/

Chemistry Libraries:

http://www.lib.berkeley.edu/CHEM/
https://www.lib.purdue.edu/libraries/chem
http://www.elementsdatabase.com
http://www-library.ch.cam.ac.uk/

Biology Libraries:

http://vlib.org/Biosciences
http://www.library.illinois.edu/bix/

Internet library:

http://www.ipl.org/

General Science Libraries

http://www.lib.unb.ca/about/science.php
http://libguides.lib.umanitoba.ca/health/