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The most complete library of Marxism with content in over 40 languages and the works of over 400 authors readily accesible by archive, sujbect, or history.

Online shopping from the earth's biggest selection of books, magazines, music, DVDs, videos, electronics, computers, software, apparel & accessories, shoes, jewelry, tools & hardware, housewares, furniture, sporting goods, beauty & person...

Quora is a continually improving collection of questions and answers created, edited, and organized by everyone who uses it.

YouTube is a place to discover, watch, upload and share videos.

Academia.edu helps academics follow the latest research.

Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with friends, upload an unlimited number of photos, post links and videos, and learn more about the people ...

Providing researchers with access to millions of scientific documents from journals, books, series, protocols and reference works.

TFD Encyclopedia includes Computer Desktop Encyclopedia, Columbia Encyclopedia and many other great sources.

San Francisco - User Reviews and Recommendations of Top Restaurants, Shopping, Nightlife, Entertainment, Services and More at Yelp