Olga and William
Up until recently I was not sure who were the lady and gentleman in the picture above. Since then, I am fairly certain of who they are. The couple most likely were Olga Dargatz and William George Bienert. Here is my reasoning.
Colossal Fungi
This picture comes from the Mary M. Dargatz collection. It is an unknown woman harvesting mushrooms. She is holding two enormous mushrooms!