NILES WEEKLY REGISTER, Baltimore, Dec. 30, 1815  Inside contains two treaties, the first: "Commercial Convention...To Regulate the Commerce Between the Territories of the U.S. and of  his Britannic Majesty" with the full text and  several signatures, including Madison and Monroe. Also a: "Treaty with Algiers" taking several pages and signed in type: James Madison.
Sixteen pages, 6 1/4 by 9 3/4 inches, nice condition.

As noted in Wikipedia, this title: "...(was) one of the most widely-circulated magazines in the United States...Devoted primarily to politics...considered an important source for the history of the period."