A picture of the Hartford appears in the Dictionary of American Fighting Ships (DANFS). The Naval Historic Center has the DANFS on-line. The URL for the "Hartford" is here:

http://www.history.navy.mil/danfs/h3/hartford.htm

A picture of the Hartford appears at the bottom of the page.

The muster rolls for Union Navy ships, for the most part, indicate the status of the ship's crew, including transfers to another ship, deaths from disease or wounds, transfer to hospital ships to hospitals on land. The muster rolls for Union Navy ships reside at the National Archives; they are in ledgers and have to be searched manually.