Statistics for occurrence #1 of “Duff Green” in chapter 57 of Admiral David D. Porter, The Naval History of the Civil War.:

... Duff Green
Assembling of the naval vessels in Hampton Roads and on the James River. operations of the armies around Richmond. ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Duff Green 126 29 20 3 0 user votes

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