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Find what you want in a library near you with WorldCat, a global catalog of library collections.

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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.

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Twitter is without a doubt the best way to share and discover what is happening right now.

The Philadelphia Area Center for History of Science (PACHS) promotes scholarly and public understanding of history of science, technology and medicine.

The authoritative Collins dictionaries now available online. Search amongst hundreds of thousands of words and expressions in Spanish, French, German, Italian, Chinese, Portuguese, Russian and synonyms dictionaries.

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