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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| O'Sullivan, G. & Gillooly, M. | 1989 | Lough Beltra 1987. Proceedings of the 4th Annual Lough Beltra Workshop, Dublin, 23rd March 1988 | Book | | Details... |
| O'Sullivan, W.M. | 1991 | The distribution of otters Lutra lutra within a major Irish river system, the Munster Blackwater catchment, 1988-90 | Journal | Ir. Nat. J. | Details... |
| Ogilby, J.D. | 1885 | Notes on some Irish fishes | Journal | Sci. Proc. R. D. S. | Details... |
| Olaloye, F. | 1974 | Some Penniretepora (Bryozoa) from the Visean of county Fermanagh with a revision of the generic name | Journal | Proc. Roy. Ir. Acad. | Details... |
| Old, R.A. | 1970 | A tertiary agglomerate vent, Spencestown, Ballymena, Co. Antrim | Journal | Ir. Nat. J. | Details... |
| Old, R.A. | 1972 | Amygdale minerals at Sounding Hill Quarry, Magherafelt, Co. Londonderry | Journal | Ir. Nat. J. | Details... |
| Old, R.A. | 1974 | The Strabane lead mine, Co. Tyrone | Journal | Ir. Nat. J. | Details... |
| Olsen, C. | 1921 | The ecology of Urtica dioica | Journal | J. Ecol. | Details... |
| Orford, J.D. | 1981 | Some problems generated by the available interpretation the origin and structure of Murlough Spit, Dundrum Bay. Murlough National Nature Reserve Scientific Report | Report | | Details... |
| Orford, J.D. & Carter, R.W.G. | 1982 | Geomorphological changes on the barrier coast of south Wexford | Journal | Ir. Geog. | Details... |
| Orme, A.R. | 1966 | Quaternary changes of sea-level in Ireland | Journal | Trans. Inst. Brit. Geogr. | Details... |
| Orr, H.L. | 1899 | The hedgehog and its food | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1900 | The hedgehog and its food | Journal | Ir. Nat. | Details... |
| Orr, J. | 1905 | Report of the Geological Section | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Orr, J. | 1912 | Local fossils and their correlation to recent types | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Orr, J. | 1914 | Report of the Geological Section | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Orr, J. | 1929 | Report of Zoological Section | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Orr, J. | 1930 | Report of Zoological Section | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Orr, J. & Loughridge, J.S. | 1935 | Report of Section of Zoology | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Oswald, D.H. | 1955 | The Carboniferous rocks between the Ox Mountains and Donegal Bay | Journal | J. Geol. Soc. Lond. | Details... |
4555 references found.