File talk:AirPollutionSource.jpg
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Citizendium does not seem to have a Public Domain license for works of a U.S. Federal Government Agency
I simply wish to point out that Citizendium seems to lack a Public Domain license for works of a U.S. Federal Government Agency.
Therefore, I selected the Citizendium choice of PD-Self which is not exactly correct. - Milton Beychok 18:55, 25 January 2008 (CST)