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John Philip Holland - Wikipedia
John Philip Holland | Biography, Submarine, & Facts | Britannica
John Philip Holland: The Father of the Modern Submarine
John Philip Holland: Irish inventor of the submarine - IrishCentral
The Irishman Who Invented the Submarine | Irish America
Holland I (SS-1) - NHHC
John P. Holland: Father of the Modern Submarine
John Philip Holland | Encyclopedia.com
John Philip Holland: the Irish inventor who helped take the …
John Philip Holland: Inventor of the Submarine - PBS America
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