Statistics for occurrence #1 of “U. S. Gun” in chapter 29 of Admiral David D. Porter, The Naval History of the Civil War.:

... U. S. Gun
The Army marches from Bruensburg towards Vicksburg. destruction of the last works built by the Confederates on the ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
U. S. Gun 8 8 0 0 0 user votes
U. S. Gunboats 4 0 0 0 0 user votes

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