HEATKEYS

Buy rare and hard to find music on vinyl records and used CDs from thousands of online record stores. Manage your music collection with a detailed discography on rock, electronic, hip hop, classical and other popular and obscure music genres.

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

The world's second largest organization of physicists, APS publishes physics journals and organizes meetings.

Academia.edu helps academics follow the latest research.

AbeBooks is your source for Used, New, Rare and Out of print books. Find classic collectibles, rare signed editions, used textbooks, and inexpensive bestsellers from independent booksellers worldwide.

Internet Archive is a non-profit digital library offering free universal access to books, movies & music, as well as 150 billion archived web pages.

AAAI advances the understanding of the mechanisms underlying thought and intelligent behavior and their embodiment in machines.

An index of current online research in Philosophy. Also contains bibliographies, discussion forums, and advanced research tools for researchers.

Scientific Literature Digital Library incorporating autonomous citation indexing, awareness and tracking, citation context, related document retrieval, similar document identification, citation graph analysis, and query-sensitive document summaries. ...

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