References United States O-class submarine

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sources

submarines, war beneath waves, 1776 present day, robert hutchinson.
gardiner, robert, conway s world s fighting ships 1906-1921 conway maritime press, 1985. isbn 0-85177-245-5.
friedman, norman submarines through 1945: illustrated design history , naval institute press, annapolis:1995, isbn 1-55750-263-3.
navsource.org diesel submarines page
pigboats.com o-boats page
digiulian, tony navweaps.com 3 /23 caliber gun
shipbuildinghistory.com craig shipbuilding page
this article incorporates text public domain dictionary of american naval fighting ships.






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