California-Iowa Connections--Iowa this trip

My grandson asked me to make him a short video with some family history. I pulled out a box and noticed that some of the relatives lived in Des Moines, Iowa. My big brothers are the little fellas in the photos on the right. The Shivers go back to Iowa and the Pease Family also. This would be my father's Maternal Side. I thought I would post a few of the old docs and photos. I wonder if the stamps are worth anything??