National Archives and Records Administration microfilm T623, roll 1552, in 1900 U.S. census, McPherson, South Dakota, population schedule Odessa Township, enumeration district (ED) 231, sheet 6, p. 37, dwelling 76, family 78, 1 June 1900.
Enumerated in household: Guthmuller, Michael, 51, Head; his wife Kateriene, age 37; sons Friederich, 15; Johan, 12; Martin, 10; Jacob, 3; August, 2months - born in April; Father, Michael, age 84; and daughters Christine, 15; Kateriene, 13; and Lydia, 6.
Friedrick and his sister, Christine, were probably twins because they were both age 15 in the 1900 Census.