Website link	Organisation	Cost	Area covered	Notes
streetdirectories.proni.gov.uk	Public Record Office for Northern Ireland (PRONI)	Free	Towns and cities in Ulster	Only 19th Century
1915crewlists.rmg.co.uk	National Maritime Museum (UK)	Free		Crew lists of the British Merchant Navy from 1915 – search by ship available
lennonwylie.co.uk	Private	Free	Cities in Ulster, Mostly Belfast, some Lisburn, Newry.	Trade and resident directories.