"New Hampshire Birth Records, Early to 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FL2G-GNL : 10 March 2018), Oscar Earl Clark, 12 Dec 1888; citing Lisbon, Grafton, New Hampshire, United States, Bureau of Vital Records and Health Statistics, Concord; FHL microfilm 1,000,376.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3Y7-VPZ : accessed 11 May 2019), Oscar E Clark in household of Charles Clark, Lisbon town, Grafton, New Hampshire, United States; citing enumeration district (ED) 65, sheet 19A, family 445, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,946.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLZQ-QJN : accessed 11 May 2019), Oscar E Clark in household of Charles Clark, Lisbon, Grafton, New Hampshire, United States; citing enumeration district (ED) ED 94, sheet 10B, family 237, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 862; FHL microfilm 1,374,875.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZJ3-V1Y : 13 March 2018), Oscar Earl Clark, 1917-1918; citing Grafton County, New Hampshire, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,711,718.
"New Hampshire Marriage Records, 1637-1947," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FLZB-43L : 27 September 2017), Oscar E. Clark and Doris Hildreth, 23 Aug 1934; citing Lisbon, , New Hampshire, Bureau of Vital Records and Health Statistics, Concord; FHL microfilm 2,057,688.
"United States World War II Draft Registration Cards, 1942," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VKJJ-6QF : 9 March 2018), Oscar Earl Clark, 1942; citing NARA microfilm publication M1936, M1937, M1939, M1951, M1962, M1964, M1986, M2090, and M2097 (Washington D.C.: National Archives and Records Administration, n.d.).
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VMXP-8PD : 20 May 2014), Oscar Clark, Apr 1974; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
Find a Grave, database and images (https://www.findagrave.com/memorial/5129042/oscar-earl-clark : accessed 05 May 2022), memorial page for Oscar Earl Clark (8 Dec 1889–6 Apr 1974), Find a Grave Memorial ID 5129042, citing Elmwood Cemetery, Franconia, Grafton County, New Hampshire, USA ; Maintained by Oscar Clark (contributor 32910332) .
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