NILES' WEEKLY REGISTER, Baltimore, Dec. 1, 1827  

 * "Flat Rock" becomes Manayunk, Philadelphia

Page 2 has an interesting article headed: "Manayunk", previously known as Flat Rock, which is a nice article on this town just north of Philadelphia.
It notes: "This new village at 'Flat Rock' on the Schuylkill, near Phila., has five cotton mills...employing 525 hands--a grist mill..." with much more on the cotton mills there. It closes with: "...All these establishments are the work of a short period of time. About six years ago there was only a toll house there--now between 2 and 3,000 inhabitants and a large town, daily increasing."
Sixteen pages, 6 by 9 1/2 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."