Statistics for occurrence #1 of “Wm. Knapp” in chapter 55 of Admiral David D. Porter, The Naval History of the Civil War.:

...w. Sherwin; Engineers: Acting First-Assistant, G. R. Bennett; Acting-Third-Assistants, D. Castana, J. R. Fulcher and Montgomery West. Lieutenant-Commander, Alex. F. Crossman; Acting-Masters, Wm. Knapp and John Myers; Acting-Ensigns, N. W. White and George Glass; Acting-Master's Mates, Samuel Flaxington and L. F. Strant; Acting-Assistant Paymaster, R. Freeman; Acting-Assistant Surgeon, D. J. Harris...
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