| Anglo-Irish literature, 1200-1582 | Seymour, St. John D. | Monograph or Collective Volume | West | 1978 |
| Anglo-Irish literature, 1200-1582 | Seymour, St. John D. | Monograph or Collective Volume | | 1929 |
| Church plate and parish records, Diocese of Cashel and Emly | Seymour, St. John D. | Monograph or Collective Volume | Diocesan Council of Cashel and Emly. [The Clonmel Chronicle (printer)] | 1930 |
| Pre-Reformation archbishops of Cashel | Seymour, St. John D. | Monograph or Collective Volume | Church of Ireland Printing & Publishing Co. | 1910 |
| Some priors of Fore, Co. Westmeath | Seymour, St. John D. | Article in Journal | | 1934 |
| The chapter-books of Cashel cathedral | Seymour, St. John D. | Article in Journal | | 1910 |
| The coarb in the mediaeval Irish church (circa 1200-1550) | Seymour, St. John D. | Article in Journal | | 1933 |
| The diocese of Emly | Seymour, St. John D. | Monograph or Collective Volume | | 1913 |
| The medieval church [and] Sidelights on the medieval church | Seymour, St. John D. | Article in Book | | 1934 |
| The medieval church [and] Sidelights on the medieval church. | Seymour, St. John D. | Article in Book | | 1934 |
| The puritans in Ireland, 1647-1661 | Seymour, St. John D. | Monograph or Collective Volume | Clarendon Press | 1969 |
| The Puritans in Ireland, 1647-1661 | Seymour, St. John D. | Monograph or Collective Volume | | 1921 |
| Three medieval poems from Kilkenny | Seymour, St. John D. | Article in Journal | | 1932 |