A volume containing three groups of transcripts made by Draper in 1851:

1) Extracts copied from records in the office of the Pennsylvania secretary of state in Harrisburg. As all were later published in Pennsylvania Archives, First series, the copies are of interest only as an indication of Draper's choice of materials.

2) Selections from a letter book, 1779-1781, of Daniel Brodhead, the original of which was owned in 1851 by R.M. Crain of Harrisburg. This is not a duplicate of Volume 3 H, but the contents supplemented that volume.

3) Copies of correspondence of William Irvine with two Europeans who had served in the Revolution. In 1851 the originals were owned by the Irvine family. A few extracts from letters, 1783-1789, written by Antoine Felix Wuibert, who had served in the Engineering Corps at Fort Pitt, relate primarily to his health and to his divorce. More extensive and informative are the letters, 1779-1804, exchanged between Irvine and Baron Gustavus Henri de Rosenthal, an Estonian nobleman known in America as John Rose. Rosenthal had left Russia after participation in a fatal duel, arrived in Baltimore in 1776, studied surgery, and then joined the Pennsylvania troops. He was made a staff officer at Fort Pitt by Irvine in 1781. After the Revolution he was pardoned by the emperor and returned to his family estate, where he died in 1830.

The Irvine-Rosenthal correspondence contains reports and recollections of the military service they had shared; the letters are accompanied by papers pertaining to Rosenthal's claims for compensation for his Pennsylvania war services.