| Caribbean slave owners & other lesser-known histories from County Mayo | O'Connor, Michael M. | Monograph or Collective Volume | Michael M. O'Connor | 2021 |
| County Mayo. A history of imprisonment, capital punishment & transportation. Part 1. Anatomy of a County Gaol | O'Connor, Michael M. | Monograph or Collective Volume | Michael M. O'Connor | 2020 |
| County Mayo. A history of imprisonment, capital punishment & transportation. Part II. Castlebar prison & the Bridewells of County Mayo, 1835-1935 | O'Connor, Michael M. | Monograph or Collective Volume | Michael M. O'Connor | 2025 |
| When crowbar & bayonet ruled : the Land War on the Belcarra estate of Harriet Gardiner & Susanna Pringle, 1879-1910 | O'Connor, James R.O'Connor, Michael M. | Monograph or Collective Volume | Original Writing | 2013 |