Statistics for occurrence #1 of “Acting-Engineers, Benj. Emerson” in chapter 25 of Admiral David D. Porter, The Naval History of the Civil War.:

...s; Acting-Carpenter, A. B. Chapman. Acting-Volunteer-Lieutenant, Jason Goudy; Acting-Ensigns, Robert Wilkinson, W. Stoneall and E. C. Roe; Acting-Master's Mates, Lloyd Thomas and E. F. Rowe; Acting-Engineers, Benj. Emerson and John Miller. Acting-Volunteer-Lieutenant, J. S. Hurd; Acting-Assistant Surgeon, D. D. Winslow; Acting-Master, G. V. Fontly; Acting-Ensign, Jos. Watson; Acting-Master's Mates, H. A. Proct...
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