Milestone documents of American history, presented by the National Archives and Records Administration.
http://www.ourdocuments.gov
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a vast collection of over 350,000 well organised free datasheets for electronic components and semiconductors including very rare component datasheets
http://www.datasheetarchive.com
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Free educational institution in the English Lake District. Bibliographies and artefacts on natural history and local people including Beatrix Potter, Ruskin and the Lake poets.
http://www.armitt.com
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Specialized collections support research in business, law, medicine and HebraicaJudaica. Research affiliation: Research Library Group.
http://www.yu.edu
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Research library in Massachusetts specialising in American history and culture up to 1876. History, catalogues, online exhibits and guides to the collection.
http://www.americanantiquarian.org
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