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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| Nunn, J.D., Day, G., Kelly, T. & Hutchinson, R. | 2007 | Some new records of Janthina janthina (L., 1758) from Ireland in 2005 | Journal | Ir. Nat. J. | Details... |
| O'Connell, M. & Sheehy Skeffington, M.J. | 1985 | Botanical notes from three sites in east Mayo and Sligo | Journal | Ir. Nat. J. | Details... |
| O'Connor, B. | 1995 | The physical and biological attributes of some Irish bays | Journal | Proc. Roy. Ir. Acad. Biol.& Env. | Details... |
| O'Connor, J. | 1945 | Annual migration of slaters on the Fastnet Rock, Co. Mayo | Journal | Ir. Nat. J. | Details... |
| O'Connor, J.P. | 2004 | Records of some rare Irish pimplines (Hymenoptera: Ichneumonidae) | Journal | Ir. Nat. J. | Details... |
| O'Connor, J.P. & Chandler, P.J. | 2006 | Records of Irish Agromyzidae (Diptera) including two species new to Ireland | Journal | Ir. Nat. J. | Details... |
| O'Malley, D.J.S. | 1979 | Asplenium cuneifolium Viv. new to west Mayo | Journal | Ir. Nat. J. | Details... |
| O'Maoileidigh, N., Browne, J., Cullen, A., McDermott, T. & Keatinge, M. | 1994 | Exploitation and survival of reared salmon released into the Burrishoole River System | Journal | Fish. Leafl. | Details... |
| Odlum, W.P., Cummins, N.P. & Grainger, J.N.R. | 1945 | Turtle dove in Co. Mayo | Journal | Ir. Nat. J. | Details... |
| Oldham, C. | 1933 | Painted lady and red admiral on the Mullet Peninsula | Journal | Ir. Nat. J. | Details... |
| Oldham, C. | 1935 | Notes on the snails of the Mullet, western Mayo | Journal | J. Conch. (Lond.) | Details... |
| Oldham, C. | 1938 | Ashfordia granulata (Alder) on Achill Island | Journal | J. Conch. (Lond.) | Details... |
| Oswald, D.H. | 1955 | The Carboniferous rocks between the Ox Mountains and Donegal Bay | Journal | J. Geol. Soc. Lond. | Details... |
| Oxbrough, A.G. | 2007 | Distribution records of some uncommonly recorded spiders in Ireland including a new Irish record: Meioneta mollis (O.P. Cambridge, 1871) (Araneae: Linyphiidae) | Journal | Ir. Nat. J. | Details... |
| Patten, C.J. | 1908 | Rambles on Achill Island | Journal | Ir. Nat. | Details... |
| Perring, F.H. | 1966 | New plant records for Co. Mayo | Journal | Ir. Nat. J. | Details... |
| Philpott, E. & Rogan, E. | 2007 | Records from the Irish Whale and Dolphin Group for 2005 | Journal | Ir. Nat. J. | Details... |
| Philpott, E., Wall, D. & Rogan, E. | 2007 | Records from the Irish Whale and Dolphin Group for 2004 | Journal | Ir. Nat. J. | Details... |
| Praeger, R.Ll. | 1898 | Impressions of Achill: flowering plants etc. | Journal | Ir. Nat. | Details... |
| Praeger, R.Ll. | 1899 | Notes on 'Cybele Hibernica' | Journal | Ir. Nat. | Details... |
406 references found.