This web site provides a searchable directory to over 6000 freely available online bilingual and multilingual dictionaries and glossaries.
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The Library of Congress's home page, linking to an extraordinary wealth of information including the Library's catalogs and its very significant digital collections.
As of June 2, 2011, all PDF versions of books published by the National Academies Press are downloadable to anyone free of charge.
Contains millions of index terms to specialized subject encyclopedias, compendia, and scholarly handbooks.