Resources for Early Data: Your genealogy library likely has books by Ms. Josephine Masterson, "Ireland 1841-51 Census Abstracts." They contain her transcriptions of portions of the Republic of Ireland. There are also extracts of data from Northern Ireland including 1841 Census record from the WILSON family transcription held at PRONI in Belfast. Extracts are divided by county, parish and townland and surname . Data includes important clues such as the county of birth if different that where they resided at the time of the census. Other impossible-to-find tidbits include the names of recently deceased members of the family and the ailment from which they died, and the names and destinations of all those who have recently immigrated. Other information includes occupations, schools the children attended, the names of servants and others living in the household, neighbors, etc. (I believe that the National Archives, Dublin, IR, also has this information, as well as your local LDS FHC on microfilm). I would say that if you know where your family lived and/or were researching an unusual surname and/or knew the surnames of associated family members, these books could potentially provide you with a windfall of undiscovered data. Samples from Ms. Masterson's books: County Cork (1841) - Co. Cork, St. Nicholas Parish, City of Cork, Teiers Walk: McCARTHY, Robert 38 head, married 1829, printer, read & write, born Co. Cork, Mary 31, wife, read & write, born Co. Kildare. John 9, William 7, Robert 5, sons, all at St. Nicholas School, born City of Cork, Welbore 1, son, born City of Cork. Judith CORKERY, 22, servant, born Co. Cork. Deceased: Margaret McCARTHY 1, dau. died 1839 measles. County Dublin (1841) - Co. Dublin, Parish of St. Thomas, City of Dublin, 10 Summer Hill: FEA, Rev. John, 72, head, married, 1795 curate of St. Thomas Parish, read & write. Elizabeth, 60, wife, read & write, Mary Ann, 42, dau, not married, read & write. Elizabeth COOKE alias FEA, 38, dau, widowed, read and write. Elizabeth COOKE JR., 12, gr dau, read and write. John Arthur TUDOR, 8, (no further data), James SHERIDAN, 28, servant, read & write, Sarah O'BRIEN, 30 housemaid, read and write. Mary CASSIDY, 24, cook, read & write - all born City of Dublin. Deceased Arthur FEA, 28, son, surgeon, died 1839 consumption. King's Co/Offaly (1841) -- Eglish Parish, Eglish Townland: BERRY, Smith M, 53 head m. 181 wid. farmer. Thomas Francis BERRY 17 son, Marlboro Parsons BERRY 15 son, 4 female and 2 male servants. Co. Roscommon, Ballintober Barony, Fuerty Parish, Cooly Townland: MANNION, Lacky 58 head, m. 1814, farmer; Bridget 54 wife, knitting; John 24 son not married, laborer; Michael 16 son, laborerer, read and write. Jane QUIGLEY 38 cousin m. 1822, servant. Absent: Patrick 25 son laborer in America. Deceased Mary 12, dau. d. 1833 measles. Co. Roscommon, Ballintober South Barony, Roscommon Parish, Ballypheasan Townland: QUIGLY, Mary 23 head not married. Catherine BANAGHAN 3 dau.; Bridget QUIGLEY 20 sister, m. 1840; Margaret QUIGLEY 17 sister; Mary MULVEY 31 not married visitor; Anne MULVEY 25 visitor, Mary LEHANY 19 visitor, Mary McDONNELL 6 visitor, Patrick FARRELL 14 mo. visitor. Deceased Bridget QUIGLY 40, mother died 1839 decay; Michael 18 brother laborer died 1836 suddenly. (Ms. Masterson notes that the spelling of townlands, surnames are as they appeared on the censuses). NOTE -- I am aware of another book in genealogy libraries containing fascinating excerpts that appeared in very early editions of the "LONDONDERRY JOURNAL." The items pertain to all of counties of Northern Ireland and some from the Republic. Don't recall exact title, but it contains the words Londonderry Journal.