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- [S3770] Ancestry.com, 1940 United States Federal Census, (Name: Online publication - Provo, UT, USA: Ancestry.com Operations, Inc., 2012.Original data - United States of America, Bureau of the Census. Sixteenth Census of the United States, 1940. Washington, D.C.: National Archives and Records Administration, 1940. T627;), Year: 1940; Census Place: Chicago, Cook, Illinois; Roll: m-t0627-00938; Page: 2A; Enumeration District: 103-554.
Record for Fred Montgomery
https://search.ancestry.com/cgi-bin/sse.dll?db=2442&h=144497256&indiv=try
- [S3347] Ancestry.com, Illinois, Deaths and Stillbirths Index, 1916-1947, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2011;).
Record for Fred H. Montgomery
https://search.ancestry.com/cgi-bin/sse.dll?db=2542&h=2551239&indiv=try
- [S5058] Ancestry.com, 1950 United States Federal Census, (Name: Ancestry.com Operations, Inc.; Location: Lehi, UT, USA; Date: 2022;), National Archives at Washington, DC; Washington, D.C.; Seventeenth Census of the United States, 1950; Year: 1950; Census Place: Seward, Kendall, Illinois; Roll: 345; Page: 2; Enumeration District: 47-19.
Record for Dorothy Montgomery
https://search.ancestry.com/cgi-bin/sse.dll?db=62308&h=218678194&indiv=try
- [S4418] Ancestry.com, Cook County, Illinois, Birth Certificates Index, 1871-1922, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2011;).
Record for Dorathy Lorr Willoughby
https://search.ancestry.com/cgi-bin/sse.dll?db=2545&h=1067941&indiv=try
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