"''Merrimac''" . . "11.7348" . . "USS ''Merrimack''" . . . . . "1860-02-16" . . . "*Burned and sunk in dock, 20 April 1861" . . . . . . . . . "1854-04-06" . "USS Merrimack (1855)" . "1855-06-15" . . . "Merrimack" . "''Merrimack''" . . . "USS Merrimack" . . . . . "83.82" . "U.S.S. ''Merrimack''" . . . "USS ''Merrimac''" . "7.3152" . "Merrimac" . "*Raised and converted into ironcladCSS Virginia" . "USS ''Merrimack'' (1855)" . "''USS Merrimack''" . "USS Merrimack (1855)" . "1856-02-20" .