Statistics for occurrence #1 of “Acting-Chief Engineer, P. R. Hartwig” in chapter 25 of Admiral David D. Porter, The Naval History of the Civil War.:

...and G. S. Baker; Acting-Gunner, Robert Sherman; Acting-Carpenter, Jos. Morton. Acting-Volunteer-Lieutenant, J. F. Richardson; Acting-Ensign, Jeremiah Irwin; Acting-Master's Mate, James Ross; Acting-Chief Engineer, P. R. Hartwig ; Engineers, J. Stough, J. C. Barr and W. Y. Sedman. Acting-Master, F. W. Flammer; Acting-Assistant Paymaster, Wm. B. Purdy: Acting-Ensigns, Wm. C. Hanford and Geo. L. Smith; Acting-Master's ...
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