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- [S11196] 1900 census, Maine, Hancock county, Year: 1900; Census Place: Brooklin, Hancock, Maine; Roll: 592; Page: 7; Enumeration District: 0042 (Reliability: 3).
- [S5650] Birth record, Maine, Name Percy Robert Atherton Gender Male Birth Date 17 Sep 1899 Birth Place Brooklin, Hancock, Maine, USA Father Almon J Atherton Mother Gertrude Carter (Reliability: 3).
- [S53751] Death record, Massachusetts, Name Robert P Atherton Race White Death Date 4/25/1912 Death Place Lynn, Massachusetts, USA (Reliability: 3).
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