"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3S3-GVT : accessed 30 January 2019), William M Whitcomb, South Middleton Township, Lower South Middleton Precinct, Cumberland, Pennsylvania, United States; citing enumeration district (ED) 28, sheet 9B, family 226, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,401.
Find A Grave, database and images (https://www.findagrave.com : accessed 29 January 2019), memorial page for William McClellan Whitcomb (14 May 1858–18 Apr 1921), Find A Grave: Memorial #94842147, citing Herr Graveyard, Boiling Springs, Cumberland County, Pennsylvania, USA ; Maintained by RCM (contributor 47037126) .
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