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With more than 750,000 human-edited definitions, Acronym Finder is the world's largest and most comprehensive dictionary of acronyms, abbreviations, and initialisms.

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Aerospace Database

This database provides indexing and abstracts from more than 4,000 current serial and non-serial titles, including content from AIAA and NASA.

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The American Memory project from the Library of Congress provides at least 261 discrete digital collections in 18 broad topical areas: Advertising; African American History; Architecture, Landscape; Cities, Towns; Culture, Folklife; Environment, Conservation; Government, Law; Immigration, American Expansion; Literature; Maps; Native American History; Performing Arts, Music; Presidents; Religion; Sports, Recreation; Technology, Industry; War, Military; and Women's History.

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The landmark American National Biography offers portraits of more than 17,400 men and women -- from all eras and walks of life -- whose lives have shaped the nation.

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Archive Finder

Archive Finder brings together ArchivesUSA and the cumulative index to the National Inventory of Documentary Sources in the UK and Ireland (NIDS UK/Ireland).

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ArchiveGrid

Online access to nearly a million descriptions of archival collections owned by thousands of libraries, museums, historical societies and archives worldwide.

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Started in August 1991, arXiv.org (formerly xxx.lanl.gov) is a highly-automated electronic archive and distribution server for research articles in the areas of physics, mathematics, computer science, nonlinear sciences, quantitative biology and statistics.

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