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  1. 1
    Published 1951
    “...National Bureau of Standards circular ;...”
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    Preservation of the Declaration of Independence and the Constitution of the United States : a report by the National Bureau of Standards to the Library of Congress.
  2. 2
    Published 1953
    “...National Bureau of Standards circular ;...”
    Book
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    Protective display lighting of historical documents; a report to the Library of Congress.

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