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National Atmospheric Deposition Program (NADP)
The purpose of this national network is "to collect data on the chemistry of precipitation for monitoring of ... long-term trends." Weekly samples are analyzed to learn acid rain (also known as "atmospheric deposition") content. The site features links to data and reports. The NADP is located at the Illinois State Water Survey, and is a cooperative program of federal, state, and non-governmental groups. 
http://nadp.sws.uiuc.edu

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