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Acid deposition includes acid rain and other acidic precipitation, but also dry deposition of acidic compounds.

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V&F Gas Analysis Systems, Inc.

http://www.vandfna.com/

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Sigma Xi

http://www.sigmaxi.org/programs/giar/index.shtml

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National Science Foundation: Earth Sciences

http://www.nsf.gov/div/index.jsp?div=EAR

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