I should have worded better, instead of giving the impression it was strictly Custer’s expedition; that’s only part of it, though naturally the oldest photos used for comparison.
Also, for the Exploring With Custer, the listed author on Amazon is Grafe, but if you check here http://isbndb.com/subject/black_hills_s_d_and_wyo_discovery_and_exploration one finds out it is actually Grafe and Horsted.
Horsted expanded the scope of the photographic work, and published the book we have.