U.S. Navy Dictionary of Fighting Ships, R.B. Forbes.
NavSource Online: Battleship Photo Archive. USS Roanoke.
USS Queen (1863) - Wikipedia
USS Somerset (1862) – Wikipedia
Genealogy page for Daniel C. Stillson.
A detailed genealogy of Stillson, along with a full account of the development of the Stillson wrench while the inventor was employed by the J.J. Walworth Company.
History of the J.J. Walworth Company
A brief history of the J.J. Walworth Company and an account of Stillson’s career, development and marketing of the Stillson pipe wrench. Information for the page was excerpted from A History of 100 Years of Valve Manufacturing - The Story of the Walworth Company, Inc. Oldest Manufacturer of Valve and Fittings in the United States. 1942.