Peter and Mary (Long) Fogle, where did you go ?

I have been looking for Peter Fogle and Mary Long for 10 years. Peter was born Aug 1854 in Ohio and Mary was born Aug 1859 in Wapello County, Iowa. They were married on 2 Jan 1876 in Scotland County, Missouri. And stay there until sometime after 1879, then moved to Appanoose County, Iowa. I loose them after 1900.