possible sources
The Church of Jesus Christ of Latter-day Saints, "Pedigree Resource File," database,FamilySearch(https://familysearch.org/ark:/61903/2:2:3HJQ-N7T : accessed 2016-06-07), entry for William C. /Landon/.
"
GENDER
Male
BIRTH
25 June 1837
Otsego County, New York
DEATH
19 December 1915
Vestal Center, NY
PARENTS
FATHER
Alvin /Landon/
MOTHER
Nancy /Griggs/
MARRIAGES (1)
SPOUSE
Anna Augusta /Ellis/
MARRIAGE
1858
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=79515053
William C. Landon
United States Civil War Soldiers Index
CITING THIS RECORD
"United States Civil War Soldiers Index, 1861-1865," database,FamilySearch (https://familysearch.org/ark:/61903/1:1:FSJG-G5M : accessed 7 June 2016), William C. Landon, Sergeant, Company , Signal Corps, US Volunteers, Union; citing NARA microfilm publication M1290 (Washington D.C.: National Archives and Records Administration, n.d.), roll 4; FHL microfilm 1,604,887."