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  • 1. U.S. Government Printing Office: Federal Digital System (FDsys)

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  • 2. udn讀書館

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    56 1 468
  • 3. Ullmann's Encyclopedia of Industrial Chemistry

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  • 4. Ulrich's Periodicals Directory (Ulrichsweb)

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  • 5. UNdata

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  • 6. UpToDate

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    775 15 7667
  • 7. USDA National Agricultural Library Collection

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  • 8. USPTO Patent Public Search tool

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