Statistics for occurrence #1 of “John Mason” in chapter 41 of Admiral David D. Porter, The Naval History of the Civil War.:

... Williams, C. E. Rich and C. Washburn; Acting-Master's Mates, W. H. Knowlton, T. W. Rock, Robert Clifford and David Fader; Engineers: Acting-First-Assistant, William McLean; Acting-Second-Assistants, John Mason and D. M. Lane; Acting-Third-Assistants, G. F. Smith and J. W. Hockett. Commander, Richard T. Renshaw; Acting-Ensign, E. S. McKeever; Acting-Master's Mates, Edw. Cassady, Chas. Fisher and Pa...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
John Mason 195 2 15 0 0 user votes
John Mason Loomis 15 0 7 0 0 user votes
John Mason Brown 5 0 3 0 0 user votes
John Mason Peck 4 0 0 0 0 user votes
John Mason Carlisle 1 0 1 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.