In the Ould Ago by Johnny McKeagney
An illustrated history of Irish folklore, full of Johnny's wonderful drawings of Fermanagh people, places and crafts.
Statistical Survey of County Monaghan, 1801
Google Books has produced a free PDF version of Charles Coote's survey.
A brief history of the Crievagh House, Ballybay, County Monaghan, Ireland, branch of the Moffett family. Free to download.
Clogher Clergy and Parishes, J. B. Leslie
Free to download in various formats.
History of Monaghan for 200 years (1660-1860)
Historical sketches of County Monaghan and Monaghan in the Eighteenth Century by Denis Carolan Rushe. Free to download.
Irish Names of Places, 3 vol.s, P. W. Joyce
The Internet Archive site has all three volumes, free to download, in PDF format.
Post Offices of County Monaghan
in 2005, with extracts available online. Clogher Historical Society holds a copy of the book in its library.
Record of the Smith family
Record of the Smith family descended from John Smith, born in 1655 in County Monaghan, Ireland.
Bibliography of British and Irish History
Online guide to British and Irish history from the Roman period to the present day. Hosted by the Institute of Historical Research, University of London.
Sacred Text Archive
Archive of online books about religion, mythology, folklore and the esoteric. The site is dedicated to religious tolerance and scholarship. Includes, for instance, The Religion of the Ancient Celts by J. A. MacCulloch (1911).
Some account of the territory or dominion of Farney
By EP Shirley. Free to download.