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NASA Langley scientists used a non-invasive technique to determine the relative humidity of the atmosphere in the encasement of the U.S. Constitution.
 

Non-invasive laser
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CAPTION: Scientists use a non-invasive technique to determine the relative humidity of the atmosphere in the encasement of the U.S. Constitution.

James West examines encasement
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CAPTION: NASA Langley researcher James West looks for the first signs of water vapor condensation in the encasement of the U.S. Constitution.

Levine and Carlin
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