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Bibliographic and Knowledge Databases: U

U.S. Census Bureau International Data Base (IDB)
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U.S. Patents
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Ulrich's Periodicals Directory
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UNdata
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Unified Medical Language System (UMLS)
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UniGene
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UniProt
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UniSTS
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Uniworld
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USDA National Nutrient Database for Standard Reference
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Alphabetical Index of Bibliographic and Knowledge Databases
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