| A seventeenth century Letterkenny manuscript | MacDonagh, J. C. T. | Article in Journal | | 1956 |
| An 18th century redoubt in county Donegal | MacDonagh, J. C. T. | Article in Journal | | 1953 |
| Barnesmore in history | MacDonagh, J. C. T. | Article in Journal | | 1961 |
| Bibliography of county Donegal | MacDonagh, J. C. T.Macintyre, Edward | Article in Journal | | 1948 |
| Bibliography of County Donegal | MacDonagh, J. C. T.Macintyre, Edward | Article in Journal | | 1947 |
| Counsellor Terence MacDonagh (d. 1713) : part 2, some collateral descendants | MacDonagh, J. C. T. | Article in Journal | | 1948 |
| Counsellor Terence MacDonagh : a great Catholic lawyer of the penal days | MacDonagh, J. C. T. | Article in Journal | | 1947 |
| County Donegal in Anglo-Irish literature | MacDonagh, J. C. T. | Article in Journal | | 1947 |
| From the MacDonagh papers | MacDonagh, J. C. T. | Article in Journal | | 1965 |
| Heirs to the O'Donnell chieftaincy | MacDonagh, J. C. T. | Article in Journal | | 1959 |
| Isaac Butt, 1813-1879 | MacDonagh, J. C. T. | Monograph or Collective Volume | [s.n.] | 1946 |
| Materials for history of Abbey of Assaroe | MacDonagh, J. C. T. | Article in Journal | | 1956 |
| Medieval and modern castles in county Donegal | MacDonagh, J. C. T. | Article in Journal | | 1956 |
| The Catholic emancipation movement in the county of Donegal | MacDonagh, J. C. T. | Article in Journal | | 1957 |
| The old Lifford corporation | MacDonagh, J. C. T. | Article in Journal | | 1956 |
| The Raphoe marriage registers : some eighteenth century Catholic marriages in the Protestant registers of the diocese of Raphoe | MacDonagh, J. C. T. | Article in Journal | | 1960 |