Statistics for occurrence #1 of “E. M. Clark” in chapter 44 of Admiral David D. Porter, The Naval History of the Civil War.:

...tant, C. F. Degelman; Acting-Gunner, William Shields; Acting-Carpenter, D. H. Curry. Lieutenant-Commander, James W. Shirk; Assistant Paymaster, Geo. A. Lyon; Acting-Ensigns, Lewis Kenney and E. M. Clark ; Engineers: Acting-Chief, J. W. Hartuper; Acting-First-Assistant, Perry South; Acting-Second-Assistant, W. J. Milligan. Lieutenant-Commander, F. M. Ramsey; Acting-Assistant Paymaster, Wm. N....
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E. M. Clark 9 8 1 0 0 user votes
E. M. Clarke 2 2 0 0 0 user votes

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