Marvin Prochaska - line 56
Source - Year: 1910; Census Place: Cedar Rapids Precinct 7, Linn, Iowa; Roll: T624_411; Page: 11B; Enumeration District: 0111; Image: 584; FHL microfilm: 1374424.
Source - Year: 1915; Iowa State Census Collection, 1836-1925; Census Place: Cedar Rapids, Linn, Iowa; Roll: IA1915_300; Image: 29700
Marvin Prochaska - line 14
Source - Year: 1920; Census Place: Cedar Rapids Ward 12, Linn, Iowa; Roll: T625_500; Page: 4A; Enumeration District: 130; Image: 680.
Marvin Prochaska - line 89
Source - Year: 1925; Iowa State Census Collection, 1836-1925; Census Place: Cedar Rapids, Linn, Iowa; Roll: IA1925_1809; Image: 172