Catherine Schriver's last name is spelled Schriver, Shriver, Schrieber.I have seen it spelled all these ways on documents.Back then people could spell the same name differently in the same letter. The Schrivers and Heislers owned adjoining land in Zion Township, Stearns County, Minnesota.
The gravestone says Nicolaus Heisler 1805---6 July 1881. Josephina Heisler Feb 1805---10 Dec 1869--Rubly. Sophia Josephina Margareth Rubly listed her name as Sophia in the 1850 census for Pennsylvania, Clearfield County, Morris Township. All the family is listed.