National Geographic: Remembering Sultana - Article by Stephen Ambrose describing the disaster in which more than 1,700 Union soldiers and POWs died when three of the Sultana's four boilers exploded.
Sabotage of the Sultana... - Offers arguments by D. H. Rule and Gene Eric Salecker for and against Rule's 2002 argument that Sultana explosion was due to sabotage.
Wikipedia: Sultana (Steamboat) - Hyperlinked article devoted to the Mississippi River paddlewheeler which was destroyed in an explosion on April 27, 1865, the greatest maritime disaster in United States history.