The Archives Service Center selected several more collections from the Darlington Library to be scanned by the Digital Research Library. Ephraim Douglass, a trader in western Pennsylvania and a soldier in the Revolutionary War, documented the stock and sale of supplies at Forts Pitt and Kittanning during the 1770s in four ledgers. Douglass's business partners during these years were his brother, Joseph, Devereaux Smith, and Richard Butler. The Rolling Rock Training Camp Ledger contains information from July 9-August 4, 1917 of guard duty in the military training camp near Ligonier, Pennsylvania. Information such as names, hours worked, and addresses were recorded in this ledger. The Monongahela Navigation Company collection summaries from annual reports (1840-1897) the damage to locks and dams on the Monongahela River due to floods and ice. The Thomas Mellon and William B. Negley Day Book contains names of clients and records of payment from their seven-year partnership. Mellon, founder of Mellon Bank and patriarch of the Mellon family, began his professional career as a lawyer, but in 1853 he established a firm with his nephew, William B. Negley. The Northern Liberties Bridge Company Ledger comprises transactions, minutes from meetings, and contracts made with the state of Pennsylvania regarding the Mechanics Street Bridge, which was built in 1836 in Pittsburgh, Pennsylvania.