Statistics for occurrence #1 of “Waterproof, La.” in chapter 45 of Admiral David D. Porter, The Naval History of the Civil War.:

... Waterproof, La.
Operations on the Tennessee and Cumberland Rivers. suppressing guerillas. gun-boats co-operating with Sherman in ex...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Waterproof, La. (Louisiana, United States) 29 7 9 1 0 user votes
Waterproof, La. (Louisiana, United States) 0 0 0 0 0 user votes

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