| Sources |
- [S29] Ancestry.com, Web: Ireland, Census, 1911, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2013;), Class: RG14.
Record for William Henry Clapp
https://search.ancestry.co.uk/cgi-bin/sse.dll?db=70564&h=13664482&indiv=try
- [S148] Ancestry.com, British Army WWI Service Records, 1914-1920, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2008;), The National Archives; London, England, UK; War Office: Soldiers' Documents, First World War Wo363.
Record for William Henry Clapp
https://search.ancestry.co.uk/cgi-bin/sse.dll?db=1219&h=298660&indiv=try
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