John Osborne and James W. Gerencser, eds., “Robert Nixon Earhart,” Dickinson Chronicles, http://chronicles.dickinson.edu/encyclo/e/ed_earhartRN.htm.
Earhart then attended the B.D. Garrett Biblical Institute in Evanston, Illinois and qualified in 1860 as a clergyman of the Methodist Episcopal Church. He returned to his home area in Iowa and joined the Upper Iowa Conference of that church, where he served congregations for the remainder of his active life. His pastorates included churches at Toledo in Tuma County, at Osage in Mitchell County, and at the First Methodist of Manchester in Delaware County. After forty-one years of service to northern Iowa, he retired from the pulpit in 1901.
Earhart married Frances Fidlar, a native of Columbus, Ohio who had grown up in Davenport, Iowa. They had one child, Robert, who later graduated from Northwestern and became a college professor. Robert Nixon Earhart died in Davenport, Iowa on August 29, 1907 and was buried in the Oakdale Cemetery there. He was seventy years old.