Statistics for occurrence #1 of “Calef” in chapter 10 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 4: The Cavalry:

...uly, and October. Passing by without comment the splendid stand of Buford's dismounted troops covering the approaches to the town of Gettysburg, in which less than three thousand cavalrymen and Calef 's battery made possible the occupation by the delayed Union army of the dominating position along Cemetery Ridge and the Round Tops, the desperate battles of the cavalry on the right and left flanks ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Calef 16 2 0 0 0 user votes
Robert Calef 34 0 0 0 0 user votes
John H. Calef 11 0 3 0 0 user votes
Benjamin Shreve Calef 8 0 0 0 0 user votes
J. H. Calef 8 0 0 0 0 user votes
John Haskell Calef 4 0 0 0 0 user votes
Joseph Calef 2 0 0 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.