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   Canonicus class monitor
   The Canonicus class monitors of the U.S. Navy were built during the American Civil War. They saw service in the Civil War and the Spanish-American War, although two of them were never commissioned. The ships were basically improved Passaics, with wood and iron upper and iron lower hulls, modified i...
   Found op http://en.wikipedia.org/wiki/Canonicus_class_monitor
   
   

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