Statistics for occurrence #1 of “W. J. Mack” in chapter 58 of Admiral David D. Porter, The Naval History of the Civil War.:

...Assistant Paymaster, P. H. Tawo; Engineers: Acting-First-Assistants, W. C. Perry and Chas. Chadwick; Second-Assistant, F. C. Goodwin; Acting-Second-Assistant, B. D. Mulligan; Acting-Third-Assistants, W. J. Mack and D. S. Clarke. Lieutenant-Commander, LeRoy Fitch; Acting-Master, W. C. Coulson; Acting-Ensigns, John Revell, D. B. Dudley and Isaac Wiltse; Acting-Masters Mates, Daniel Molony, O. W. Mile...
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