| Sources |
- [S282] Ordnance Survey, Station List 1914, (Name: Ordnance Survey; Location: Southampton; Date: 1914;), Station list of Royal Engineers employed on the Ordnance Survey - 1 January 1914.
Transcription by Clive Boocock - 2021
- [S95] Ancestry.com, UK, WWI Service Medal and Award Rolls, 1914-1920, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2014;), The National Archives of the UK; Kew, Surrey, England; WWI Service Medal and Award Rolls; Class: WO 329; Piece Number: 327.
Record for Alfred E O'Brien
http://search.ancestry.co.uk/cgi-bin/sse.dll?db=IWOServiceMedalAwardRolls&h=3526655&indiv=try
- [S95] Ancestry.com, UK, WWI Service Medal and Award Rolls, 1914-1920, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2014;), The National Archives of the UK; Kew, Surrey, England; WWI Service Medal and Award Rolls; Class: WO 329; Piece Number: 2572.
Record for A O'Brien
http://search.ancestry.co.uk/cgi-bin/sse.dll?db=IWOServiceMedalAwardRolls&h=5157668&indiv=try
- [S3] Ancestry.com, British Army WWI Medal Rolls Index Cards, 1914-1920, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2008;).
Record for Alfred O'Brien
http://search.ancestry.co.uk/cgi-bin/sse.dll?db=MedalRolls&h=4204180&indiv=try
- [S194] Ancestry.com, 1939 England and Wales Register, (Name: Ancestry.com Operations, Inc.; Location: Lehi, UT, USA; Date: 2018;), The National Archives; Kew, London, England; 1939 Register; Reference: RG 101/2387E.
Record for Alfred E O'Brien
https://search.ancestry.co.uk/cgi-bin/sse.dll?db=61596&h=3029815&indiv=try
- Details: 1901 Census.
- Details: 1921 Census.
- [S154] Ancestry.com, England & Wales, Civil Registration Death Index, 1916-2007, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2007;), General Register Office; United Kingdom; Volume: 2b; Page: 1057.
Record for Alfred E O'Brien
https://search.ancestry.co.uk/cgi-bin/sse.dll?db=7579&h=29826336&indiv=try
- Details: July 1918 List.
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