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The National Atmospheric Deposition Program's Copyright Use Conditions include this statement::

Data and information presented on this website (http://nadp.sws.uiuc.edu/) are in the public domain, unless otherwise indicated. Some images and graphics on this website have been created by other organizations and are used by the NADP with permission. Under copyright law, if you want to use images or graphics used by the NADP with permission, you first need to obtain the permission of the copyright holder.

(1) Since it was not otherwise indicated, this image is in the public domain.

The copyright use conditions also include this statement:

We request one copy of any printed publication using NADP data be sent to the NADP Program Office at the address below. Citations or electronic copies are acceptable. For on-line uses, we request that the author notify the Program Office of the URL address of the online publication or website that includes NADP data.

(2) The online address to which the the above notification is to be sent is given as the NADP Program Office at nadp@sws.uiuc.edu and the requested notice has been sent to that address by email.