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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| O'Connell, M. | 1997 | Pilot whale Globiocephala melaena (Traill) | Journal | Ir. Nat. J. | Details... |
| O'Connell, M. & Fairley, J.S. | 1994 | (Pilot whale record) | Journal | Ir. Nat. J. | Details... |
| O'Connor, B. & Farinas Franco, J.M. | 2003 | Conchoderma auritum (L.) (Cirripedia) recorded from a sperm whale Physeter catodon L. washed up at Claddaghduff, Co. Galway | Journal | Ir. Nat. J. | Details... |
| O'Connor, M.L. & Fairley, J.S. | 1994 | Bottle-nosed dolphin Tursiops truncatus (Montagu) | Journal | Ir. Nat. J. | Details... |
| O'Connor, M.L. & Fairley, J.S. | 1996 | Bottle-nosed dolphin Tursiops truncatus (Montagu) | Journal | Ir. Nat. J. | Details... |
| O'Donnell, D. | 1991 | (Pilot whale record) | Journal | Ir. Nat. J. | Details... |
| O'hUalllachain, D. & Gilleran, J. | 2005 | Long-finned pilot whale Globicephala melaena (Traill), in Co. Galway | Journal | Ir. Nat. J. | Details... |
| O'Riordan, C.E. | 1969 | Recent strandings on the Irish coast | Journal | Ir. Nat. J. | Details... |
| O'Riordan, C.E. | 1972 | Provisional list of Cetacea and turtles stranded or captured on the Irish coast | Journal | Proc. Roy. Ir. Acad. | Details... |
| O'Riordan, C.E. | 1981 | A review of the provisional list of Cetacea stranded or captured on the Irish coast | Journal | Ir. Nat. J. | Details... |
| O'Riordan, C.E. | 1981 | Marine fauna notes from the National Museum of Ireland - VII. | Journal | Ir. Nat. J. | Details... |
| O'Riordan, C.E. | 1981 | Review: 'Irish whales and whaling' by J.S. Fairley | Journal | Ir. Nat. J. | Details... |
| O'Riordan, C.E. | 1982 | Marine fauna notes from the National Museum of Ireland - 8. | Journal | Ir. Nat. J. | Details... |
| O'Riordan, C.E. | 1984 | Sperm whale Physeter catodon L. | Journal | Ir. Nat. J. | Details... |
| O'Riordan, C.E. | 1984 | (Common porpoise record) | Journal | Ir. Nat. J. | Details... |
| O'Riordan, C.E. & Bruton, T. | 1986 | Notes on the crania of the euphrosyne dolphin Stenella coeruleoalba (Meyen) in the collections of the National Museum of Ireland | Journal | Ir. Nat. J. | Details... |
| O'Shea, J. | 1992 | Pilot whale Globiocephala melaena (Traill) | Journal | Ir. Nat. J. | Details... |
| O'Shea, J. | 1992 | (Euphrosyne dolphin record) | Journal | Ir. Nat. J. | Details... |
| O'Shea, J. | 1993 | White-sided dolphin Lagenorhynchus acutus (Gray) | Journal | Ir. Nat. J. | Details... |
| O'Shea, J. | 1994 | Pilot whale Globiocephala melaena (Traill) | Journal | Ir. Nat. J. | Details... |
369 references found.