| Sources |
- [S8824] 1900 census, California, Los Angeles county, Year: 1900; Census Place: Los Angeles Ward 1, Los Angeles, California; Page: 15; Enumeration District: 0006 (Reliability: 3).
- [S9333] Cemetery index, Forest Lawn Memorial Park,Los Angeles, California, (Find-a-Grave).
- [S53634] Death index, California, (Ancestry.com. California, Death Index), Name: Bertram E Lawrence Social Security #: 545466591 Gender: Male Birth Date: 28 Dec 1889 Birth Place: California Death Date: 16 Nov 1973 Death Place: Los Angeles (Reliability: 3).
- [S45953] 1940 census, California, Los Angeles county, Year: 1940; Census Place: Los Angeles, Los Angeles, California; Roll: m-t0627-00426; Page: 8B; Enumeration District: 60-592 (Reliability: 3).
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