"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9PX-HMC : accessed 1 September 2021), Mary C Loomis in household of Geo W Loomis, Township 4, Lassen, California, United States; citing enumeration district (ED) 51, sheet 1B, family 11, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,088.
"California Death Index, 1905-1939," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKS9-47CF : 23 February 2021), Mary C Loomis, 1932; citing 31160, Department of Health Services, Vital Statistics Department, Sacramento; FHL microfilm 1,686,049.
Find a Grave, database and images (https://www.findagrave.com/memorial/38000926/mary-clara-loomis : accessed 01 September 2021), memorial page for Mary Clara Gerig Loomis (17 Feb 1873–27 Apr 1932), Find A Grave: Memorial #38000926, citing Hillside Cemetery, Bieber, Lassen County, California, USA ; Maintained by Martha Shanahan (contributor 47224652) .
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