I believe this is a Peter Force 1843 facsimile printing of the Declaration of Independence from Peter Force's American Archives: Volume 1 released in 1848, printed on rice paper using W.J.Stone's original copper engraving plate, then folded & inserted into the back of the book volume. Only a few hundred made. Slight foxing on top left quadrant. A very rare opportunity to own a Declaration of Independence printed from the original William Stone copper engraved plate.