Statistics for occurrence #1 of “McCullough” in chapter 13, page 19 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Index:

...
X., 315. McCullough H., quoted, VIII., 136. McCutcheon, chief engineer, U. S. N., VI., 113. MacDonald, E., II., 330. MacDonald's battery, I., 358. VI., 57. MacDougall, C. D., X., 2. ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
† McCullough 95 2 19 0 0 user votes
Ben McCullough 51 0 5 0 0 user votes
James McCullough 37 0 11 0 0 user votes
Benjamin McCullough 31 0 3 0 0 user votes
Hugh W. McCullough 17 0 1 0 0 user votes
F. McCullough 15 0 1 0 0 user votes
John McCullough 15 0 1 0 0 user votes
Alexander McCullough 14 0 0 0 0 user votes
William R. McCullough 8 0 2 0 0 user votes
Charles McCullough 6 0 2 0 0 user votes
Patrick McCullough 6 0 0 0 0 user votes
William McCullough 6 0 2 0 0 user votes
Henry McCullough 4 0 0 0 0 user votes
Hugh McCullough 4 0 0 0 0 user votes
Jim McCullough 4 0 0 0 0 user votes
Samuel Thomas McCullough 4 0 2 0 0 user votes
J. S. McCullough 3 0 1 0 0 user votes
C. C. McCullough 2 0 0 0 0 user votes
D. W. McCullough 2 0 0 0 0 user votes
George McCullough 2 0 0 0 0 user votes
H. McCullough 2 0 0 0 0 user votes
H. A. McCullough 2 0 0 0 0 user votes
H. E. McCullough 2 0 0 0 0 user votes
J. B. McCullough 2 0 0 0 0 user votes
J. W. McCullough 2 0 0 0 0 user votes
James T. J. McCullough 2 0 0 0 0 user votes
Passmore McCullough 2 0 0 0 0 user votes
R. D. McCullough 2 0 0 0 0 user votes
J. McCullough 1 0 1 0 0 user votes
J. M. McCullough 1 0 1 0 0 user votes
John D. McCullough 1 0 1 0 0 user votes
L. A. McCullough 1 0 1 0 0 user votes
Louise McCullough 1 0 1 0 0 user votes
Peter McCullough 1 0 1 0 0 user votes
R. McCullough 1 0 1 0 0 user votes
Robert McCullough 1 0 1 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.