1.  Marriage Record:

2.  Anon.  1886.  History of Seneca County, Ohio.  Warner, Beers, & Co., Chicago (online at HeritagePursuit):  On p. 792:

Clinton Township... JOEL KELLER (deceased) was born in Fairfield County, Ohio, February 28, 1821; son of John and Elizabeth Keller, natives of York County, Penn., and who moved to Fairfield County, Ohio, in 1805, there remaining until 1828 when they came to Clinton Township, this county, where they remained until their death, Mrs. Keller dying in 1857 and Mr. Keller in 1859.  Our subject was united in marriage January 1, 1860, with Mary A. Cupp, born in Fairfield County, Ohio, February 5, 1834, daughter of William and Catharine Cupp, natives of Virginia, who were married in Fairfield County, Ohio, and in 1865 moved to Tiffin, this county, where they now reside.  Mr. and Mrs. Keller were the parents of two children: George W. and Carrie E.  Mr. Keller was reared on a farm, and was engaged in farming and milling most of his life.  At the time of his death he owned two mills and over 400 acres of fine land.  He was a faithful member of the Methodist Protestant Church.  He departed this life September 15, 1881, leaving a widow and two children, besides a host of friends, to mourn his loss.  Mrs. Mary A. C. Keller is a devoted adherent of the Methodist Protestant Church.