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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| O'Mahony, E. | 1938 | Aepus robini Lab at Howth, Co. Dublin | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1938 | Pelophila borealis Payk. and Stenolophus mixtus Herbst. in County Dublin | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1938 | A note on Irish Coleoptera | Journal | Ent. Monthly Mag. | Details... |
| O'Mahony, E. | 1939 | Birds' nest beetles | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1940 | Some Irish Coleoptera records | Journal | Ent. Monthly Mag. | Details... |
| O'Mahony, E. | 1944 | Macroplea appendiculata Panzer (Coleoptera: Chrysomelidae) in Ireland | Journal | Ent. Monthly Mag. | Details... |
| O'Mahony, E. | 1948 | Anommatus 12-striatus Mull. (Coleoptera: Colydiidae) and Adalia bipunctata (Coleoptera: Coccinellidae) in Co. Dublin | Journal | Ent. Monthly Mag. | Details... |
| O'Mahony, E. | 1949 | Lyctus brunneus Steph. (Coleoptera: Lyctidae) and Heterobostrichus aequalis Waterh. (Coleoptera: Bostrichidae) in Ireland | Journal | Ent. Monthly Mag. | Details... |
| O'Riain, S., Ryan, M.F. & McNaeidhe, F. | 1977 | Carabid beetles and the biological control of the cabbage root fly | Book | | Details... |
| O'Riordan, C.E. | 1964 | A recent record of crawfish, Palinurus vulgaris Latreille from Dalkey, Co. Dublin | Journal | Ir. Nat. J. | Details... |
| O'Riordan, C.E. | 1964 | Nephrops norvegicus, the Dublin Bay Prawn, in Irish waters | Journal | Sci. Proc. R. D. S. | Details... |
| O'Riordan, C.E. | 1965 | A carnivorous isopod from Irish waters | Journal | Ir. Nat. J. | Details... |
| O'Riordan, C.E. | 1975 | Notes on the occurrence of Charonia lampas (L.) off the Co. Kerry coast | Journal | Ir. Nat. J. | Details... |
| O'Riordan, C.E. | 1983 | Some observations on the occurrence of Paromola cuvieri (Risso) (Crustacea) off the Irish coast | Journal | Ir. Nat. J. | Details... |
| O'Sullivan, G. | 1983 | The intertidal fauna of Aughinish Island, Shannon, Co. Limerick | Journal | Ir. Nat. J. | Details... |
| O'Sullivan, G. | 1986 | Lough Beltra 1984. Proceedings of the 1984 Lough Beltra Workshop, Galway, March 2nd, 1985 | Book | | Details... |
| O'Sullivan, G. | 1987 | Lough Beltra 1986. Proceedings of the 3rd Annual Lough Beltra Workshop, Galway, 25 February 1987 | Book | | Details... |
| Oliver, G.A. & Healy, B. | 1998 | Records of aquatic fauna from coastal lagoons in Ireland | Journal | Bull. Ir. biogeog. Soc. | Details... |
| Orr, H.L. | 1899 | The dispersal of Mollusca etc. | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1903 | Convolvulus hawk-moth near Belfast | Journal | Ir. Nat. | Details... |
1365 references found.