Statistics for occurrence #1 of “Captain John Ericsson” in chapter 15.63 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: The Opening Battles. Volume 1.:

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Captain John Ericsson , Inventor of the Monitor. The introduction of General Paixhans's brilliant invention, the shell-gun, in 1824, followed, in 1858, by the successful application of armor-plating to the steam-frigat...
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