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| - Many of the collections have been donated to NLM and contain published and unpublished items, including books, journal volumes, pamphlets, diaries, letters, manuscripts, photographs, audiotapes, video clips, and other materials.http://www.scicentral.com/ - SciCentral - Labeled Gateway to the bestscience news sources, SciCentral pulls research news from the most reputable and reliable sources an
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