David Montgomery Logan

Hi

You might try 

http://www.proni.gov.uk/index/family_history.htm

http://www.nationalarchives.gov.uk/records/looking-for-person/

What religion was David? Most church records only go back as far as the early 1800s -you might try:

http://www.presbyterianhistoryireland.com

http://ireland.anglican.org/about/42

and

http://www.nationalarchives.ie/.

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Kind regards,                    

Genealogy Support

Ireland Reaching Out