This is a list in progress!
DATABASES online for the state of Indiana (Fountain included, of course :)
The Fountain County Genealogy Society has a really good selection -- PLEASE go visit them - they're wonderful helping you :)
1955 Hillsboro Telephone Book (listings here)
Fountain County, Indiana, cemetery inscriptions
Fort Wayne, Ind.: Recopied by the Public Library of Fort Wayne and Allen Co., 1965, 287 pgs.
Earl, Lydia Melinda.
Marriages in Fountain County, Indiana, U.S.A., 1826-1848
Attica, Ind.?: The Chapter, 1932, 125 pgs.
Beckwith, H. W.
History of Fountain County : together with historic notes on the Wabash Valley, gleaned from early authors, old maps and manuscripts, private and official correspondence, and other authentic, though, for the most part, out-of-the-way sources
Chicago: H.H. Hill and N. Iddings, 1881, 1001 pgs.
Judy L Harvey
Wallace (Jacksonville or "Jackville") and Jackson Township, Fountain County, Indiana: A geographical, geological, historical, photographical, and biographical ... for Wallace Sesquicentennial, 1832-1982
FOUNTAIN COUNTY, INDIANA, COURT RECORDS: BOOK I
~ Miriam L. (compiler) Luke