- Engines of Our Ingenuity: John Ericsson
 - Designer of an early locomotive and the Ericsson hot-air engine, but whose greatest innovations were in naval development, including the screw propeller, the gun turret, and the USS Monitor, the first modern naval war vessel. - Inventor Profile: John Ericsson
- Brief overview from the National Inventors Hall of Fame.
- John Ericsson (1803-1889)
- Includes biography, photographs, and information about the USS Princeton and USS Monitor. From the Naval Historical Centre.
- John Ericsson National Memorial
- Located on the National Mall in Washington, D.C. Includes travel guide and information about Ericsson's life.
- John Ericsson: Designer of the Monitor
- Describes the inventor's problems with the U.S. Navy after the explosion of the USS Princeton in 1844 and his development and construction of the USS Monitor.
- USS Monitor@
- Find sites for USS Monitor, the first ever ironclad warship commissioned by the U.S. Navy which sank while under tow in the Atlantic Ocean. Sites include history, list of crew members, photographs, first person accounts, virtual tour of the ship and the wreck, conservation efforts, and sites for its Swedish engineer-designer, John Ericsson.
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