Statistics for occurrence #1 of “Dahlgren, J. A.” in chapter 4 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Index:

... Dahlgren, J. A.
Da Costa, B. VII., 226. X., 103. III., 342. VI., 48, 109. and his daguerreotype, I., 3...
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