Library / Ref.

TwitterFacebook
Get flash to fully experience Pearltrees
http://www.encyclopedia.com/

Encyclopedia.com

International Encyclopedia of the Social Sciences

Online Literature Library

http://www.literature.org/authors/darwin-charles/the-origin-of-species/ Preface Introduction Chapter 1 - Variation Under Domestication
As Seen On

Read Print Library

http://www.readprint.com/
Refdesk's 2012 goal is to raise $55,000. http://www.refdesk.com/

Refdesk.com

Open Library is an open, editable library catalog, building towards a web page for every book ever published. More Just like Wikipedia, you can contribute new information or corrections to the catalog.

Open Library

http://openlibrary.org/
The Internet Archive, a 501(c)(3) non-profit, is building a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, we provide free access to researchers, historians, scholars, and the general public. http://www.archive.org/

Internet Archive: Digital Library