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

...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. Proctor, Jos. Hurd and E. C. Williams; Acting-Engineers, Wm. McLain , Edward Lozier and C. C. Hamilton. Acting-Volunteer-Lieutenant, Chas. G. Perkins; Acting Assistant Surgeon, W. W. Howard; Acting-Assistant Paymaster, Horace Talcott; Acting-Ensigns, J. B. Da...
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