Statistics for occurrence #1 of “O. P. Thompson” in chapter 51 of Admiral David D. Porter, The Naval History of the Civil War.:

...tant Paymaster, Frank Clark; Acting-Ensigns, Thomas Nelson, Ambrose Felix and J. A. Havens; Acting-Master's Mate, G. B. Hall; Engineers: Acting-Second-Assistant, Alfred Clum; Acting-Third-Assistants, O. P. Thompson and C. B. Wright. Acting-Master, G. C. Shultze; Acting-Assistant Surgeon, Wm. Neilson, Jr.; Acting-Assistant Paymaster, Samuel Anderson; Acting-Ensigns, Benjamin Walker and D. W. Hodson; Act...
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