| Sources |
- [S738] 1930 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2002;), Year: 1930; Census Place: Queens, Queens, New York; Roll: 1604; Page: 8A; Enumeration District: 1281; Image: 107.0; FHL microfilm: 2341338.
Record for William H Koch
- [S733] 1940 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2012;), Year: 1940; Census Place: New York, Queens, New York; Roll: T627_2735; Page: 5B; Enumeration District: 41-789.
Record for William Koch
- [S738] 1930 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2002;), Year: 1930; Census Place: Queens, Queens, New York; Roll: 1604; Page: 8A; Enumeration District: 1281; Image: 107.0; FHL microfilm: 2341338.
Record for William H Koch
- [S733] 1940 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2012;), Year: 1940; Census Place: New York, Queens, New York; Roll: T627_2735; Page: 5B; Enumeration District: 41-789.
Record for William Koch
- [S738] 1930 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2002;), Year: 1930; Census Place: Queens, Queens, New York; Roll: 1604; Page: 8A; Enumeration District: 1281; Image: 107.0; FHL microfilm: 2341338.
Record for William H Koch
- [S733] 1940 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2012;), Year: 1940; Census Place: New York, Queens, New York; Roll: T627_2735; Page: 5B; Enumeration District: 41-789.
Record for William Koch
- [S733] 1940 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2012;), Year: 1940; Census Place: New York, Queens, New York; Roll: T627_2735; Page: 5B; Enumeration District: 41-789.
Record for William Koch
- [S2167] Arthur Charles Toppin and Sophy Margaret Koch Engagement Announcement, The Brooklyn Daily Eagle, (Name: I. Van Anden; Location: Brooklyn, NY; Date: 16 May 1945;), page 15, column 3; accessed 6 Aug 2014.
- [S738] 1930 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2002;), Year: 1930; Census Place: Queens, Queens, New York; Roll: 1604; Page: 8A; Enumeration District: 1281; Image: 107.0; FHL microfilm: 2341338.
Record for William H Koch
- [S2166] Arthur Charles Toppin and Sophy Margaret Koch Marriage Announcement, The Brooklyn Daily Eagle, (Name: I. Van Anden; Location: Brooklyn, NY; Date: 31 Aug 1945;), page 13, column 3; accessed 6 Aug 2013.
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