CO. MAYO -- Re: St. Muiredach's College, Ballina. The National Library of Ireland (Dublin) has the roll from 1906-1979. It is located there under these numbers NL Ir 259 m2/Ir. 37941 s 18, per John Grenham's "Tracing Your Irish Ancestors." Your local LDS (Mormon) Family History Centers may also have this data on microfilm. Estate Records -- Landlords in Co. Mayo (mostly 1700s-early 1800s) included Lord Altamont (Westport Estate); Earl of Arran; Col. John Browne (land also in Co. Galway), Lord Clanmorris; Domville; ?first name; Francis Blake Knox (land also in Galway & Roscommon); Henry Knox; Thomas Medlicott; Sir Neal O'Donel; Sir Samuel O'Malley. See John Grenham's book for more details. There is also earlier Mayo landowner data for the 17th century (1600s) in "R. Soc. Antiqu. of Ire. Jnl," 1962. pg. 153-62 in NLI (Dublin). Trade directory with Mayo info. at the NLI: 1824 Pigot and Co., "City of Dublin and Hibernian Provincal Directory; 1846 Slater's National Commercial Directory of Ireland; 1856 Slater's Royal National Commercial Directory of Ireland; 1870 Slater's Directory of Ireland; 1881 Slater's Royal National Commercial Directory of Ireland; 1894 Slater's Royal Commercial Directory of Ireland. **Also look for MacDonald's Irish Directory (pub. in Scotland), a little-known trade directory for Ireland. Check and see if your local LDS FHC has these on microfilm. Local journals for Mayo include: "Cathair na Mart" (Journal of the Westport Historical Society) "North Mayo Historical and Archaeological Journal." These can be found in the NLI (Dublin). Apparently circa 1796 many Catholics emigrated from Ulster to Mayo including Armagh to the Westport area. The Griffith's Valuation was taken in Co. Mayo in 1856/7. Censuses -- 1901 and 1911.