Great photos so far. Here's a few from my dad's collection.
CDV of a treasury note that was back stamped from the US Treasury.
Cabinet photo showing the plight of the grasshopper invasion in Kansas 1870's.
Two mounted images of the Bloody Benders 1873. They were a family of serial killers. These photos show them locating the bodies of their victims. The family was never found and remains a mystery today.
http://en.wikipedia.org/wiki/Bloody_Benders