Sources

1. 1900 United States Federal Census; Name: Alfred Kraus; Age: 22; Birth Date: Feb 1878; Birthplace: Bohemia; Home in 1900: Manhattan, New York, New York; Race: White; Gender: Male; Immigration Year: 1888; Relation to Head of House: Son; Marital Status: Single; Father's Name: Joseph A Kraus; Father's Birthplace: Bohemia; Mother's Name: Kammilla Kraus; Mother's Birthplace: Bohemia.
2. New York, Marriages, 1686-1980
3. New York State Census, 1905
4. 1910 United States Federal Census; Name: Alfred A Kraus; Age in 1910: 31; Birth Year: 1879; Birthplace: Austria; Home in 1910: Bronx Assembly District 34, New York, New York; Race: White; Gender: Male; Immigration Year: 1889; Relation to Head of House: Head; Marital Status: Married; Spouse's Name: Helena Kraus; Father's Birthplace: Austria; Mother's Birthplace: Austria.
5. World War I Draft Registration Cards, 1917-1918; Name: Alfred Arion Kraus; City: Manhattan; County: New York; State: New York; Birth Date: 12 Feb 1878; Race: White; FHL Roll Number: 1786809; DraftBoard: 149.
6. 1920 United States Federal Census; Name: Alfred A Kraus; Age: 42; Birth Year: abt 1878; Birthplace: Bohemia; Home in 1920: Irvington, Westchester, New York; Race: White; Gender: Male; Immigration Year: 1888; Relation to Head of House: Head; Marital Status: Married; Spouse's Name: Helena Kraus; Father's Birthplace: Bohemia; Mother's Birthplace: Bohemia; Home owned: Rent; Able to read: Yes; Able to Write: Yes.
7. 1930 United States Federal Census; Name: Alfred A Kraus; Gender: Male; Birth Year: abt 1878; Birthplace: Czechoslovakia; Race: White; Home in 1930: Irvington, Westchester, New York; Marital Status: Married; Immigration Year: 1887; Relation to Head of House: Head; Spouse's Name: Helena Kraus; Father's Birthplace: Czechoslovakia; Mother's Birthplace: Czechoslovakia.