64 Pa. Stat. § 151
In all cases where an agreement has been entered into between an original warrant holder or his legal representative, and an actual settler, to settle and improve a tract of land, previous to such settler taking possession of said tract of land, lying north and west of the rivers Ohio and Allegheny, and Conewango creek, surveyed on an original warrant, and said settler or his legal representative has made such actual settlement, continued residence and improvements thereon, as are described in the ninth section of the act of April 3, 1792, although after the time required by said act in such cases, the commonwealth doth hereby ratify and confirm the title to such tract to the parties aforesaid, according to their said agreement: Provided, That the claim of any other person or persons who hold adverse to such contracting parties, shall not be affected by anything herein contained.
64 P.S. § 151