| A great Irish soldier - 'Murrough of the burnings', born 1614 - died 1674 | O'Brien, M. | Article in Journal | | 1965 |
| A hidden phase of American history : Ireland's part in America's struggle for liberty | O'Brien, M. J. | Monograph or Collective Volume | Genealogical Publishing | 1973 |
| An authoritative account of the earliest Irish pioneers in New England | O'Brien, M. J. | Article in Journal | | 1919 |
| An interesting example of the extent of Irish emigrations to the American colonies | O'Brien, M. J. | Article in Journal | | 1928 |
| Corpus genealogiarum Hiberniae, 1 | | Monograph or Collective Volume | Dublin Institute for Advanced Studies | 1962 |
| Early Irish families in Virginia | O'Brien, M. J. | Article in Journal | | 1916 |
| Early Irish settlers at Worcester, Mass. | O'Brien, M. J.Towne, W. H. | Article in Journal | | 1919 |
| Fled Bricrenn | O'Brien, M. A. (Michael Alphonsus) | Article in Book | | 1959 |
| George Washington's associations with the Irish | O'Brien, M. J. | Monograph or Collective Volume | P. J. Kennedy | 1937 |
| Irish immigrants from English ports in the eighteenth century | O'Brien, M. J. | Article in Journal | | 1919 |
| Irish immigrants to New England - extracts from the minutes of the selectmen of the town of Boston, Mass. | O'Brien, M. J. | Article in Journal | | 1914 |
| Irish origin-legends | O'Brien, M. A. (Michael Alphonsus) | Article in Book | | 1954 |
| Irish pioneers in Hartford county, Connecticut : extracts from the land, church, probate and military records | O'Brien, M. J. | Article in Journal | | 1928 |
| Irish settlers in Connecticut in the seventeenth and eighteenth centuries | O'Brien, M. J. | Article in Journal | | 1925 |
| Irish settlers in Orange county, New York | O'Brien, M. J. | Article in Journal | | 1928 |
| Irish settlers in Pennsylvania | O'Brien, M. J. | Article in Journal | | 1906 |
| Irish settlers in Queen's county, city of New York | O'Brien, M. J. | Article in Journal | | 1928 |
| Local traditions : place-names | O'Brien, M. A. (Michael Alphonsus) | Article in Book | | 1957 |
| Miscellanea Hibernica | O'Brien, M. A. (Michael Alphonsus) | Article in Journal | | 1938 |
| Old Irish personal names | O'Brien, M. A. (Michael Alphonsus) | Article in Journal | | 1973 |
| Some early Murphys in North Carolina | O'Brien, M. J. | Article in Journal | | 1911 |
| Some traces of the Irish settlers in the colony of Massachusetts Bay | O'Brien, M. J. | Article in Journal | | 1919 |
| The Book of Leinster, formerly Lebar na Núachongbála. 5 vols. | | Monograph or Collective Volume | Institute for Advanced Studies | 1954 |
| The Irish in New London, Conn., in the 17th and 18th centuries : the interesting diary of Joshua Hempstead | O'Brien, M. J. | Article in Journal | | 1927 |
| The Irish in the American colonies | O'Brien, M. J. | Article in Journal | | 1927 |
| The Irish in the Dutch records of the city of New York | O'Brien, M. J. | Article in Journal | | 1928 |
| The Irish in the New Jersey probate records | O'Brien, M. J. | Article in Journal | | 1928 |
| The Old Irish life of St. Brigit | | Article in Journal | | 1939 |
| The oldest account of the raid of the Collas (circa A.D. 330) | | Article in Journal | | 1939 |