I was at a local used bookstore and came across some nice books on the victorian era.
Victorian Colonial Warfare: India by Donald Featherstone (probably considered to be the father of miniatures wargaming) is a great and informative book. It covers The Conquest of Sind, The Gwalior War, The First Sikh War, The Second Sikh War, and The Indian Mutiny. The book really captures the period and there are plenty of photographs and illustrations.
I also found a copy of The Spanish American War by Donald M. Goldstein and Katherine V. Dillon, with J. Michael Wenger and Robert J. Cressman. Also a great book filled with information on the Spanish-American War and photographs to go along with it.