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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| 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... |
| 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... |
| Orr, H. | 1901 | The common lizard in Antrim | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1900 | Insect notes from County Antrim | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1909 | Hymenoptera from County Antrim and Down | Journal | Ir. Nat. | Details... |
| Owens, B., Gueinn, K.J. & Cameron, I.B. | 1977 | A Tournaisian miospore assemblage from the Altagoan Formation (Upper Calciferous Sandstone), Draperstown, Northern Ireland | Journal | Pollen Spores | Details... |
| Oxford, G.S. & Chesney, H.C.G. | 1994 | Large house spiders Tegenaria spp. in Northern Ireland: previously overlooked species or recent introductions | Journal | Ir. Nat. J. | Details... |
| Oxford, G.S. & Ross, H.C.G. | 1993 | Three Tegenaria species newly recorded from Northern Ireland | Journal | Brit. Arach. Soc. Newsletter | Details... |
| Pack-Beresford, D.R. | 1907 | Cyclisticus convexus in County Down | Journal | Ir. Nat. | Details... |
| Pack-Beresford, D.R. | 1923 | Algal discolouration of Lough Neagh and the River Bann | Journal | Ir. Nat. | Details... |
| Pack-Beresford, D.R. | 1937 | Algal discolouration of Lough Neagh and the River Bann | Journal | Ir. Nat. J. | Details... |
| Pack-Beresford, D.R. | 1938 | Algal discolouration of Lough Neagh and the River Bann | Journal | Ir. Nat. J. | Details... |
| Padget, P. | 1951 | The geology of the Clogher-Slieve Beagh area, Co. Tyrone | Journal | Sci. Proc. R. D. S. | Details... |
| Padget, P. | 1952 | Carboniferous beds at Kildress, Co. Tyrone | Journal | Ir. Nat. J. | Details... |
| Padget, P. | 1953 | The stratigraphy of Cuilcagh, Ireland | Journal | Geol. Mag. | Details... |
| Parker, J.G. | 1984 | The distribution of the subtidal Amphipoda in Belfast Lough in relation to sediment types | Journal | Ophelia | Details... |
| Parker, J.G., Rosell, R.S. & MacOscar, K. | 1988 | The phytoplankton production cycle in Belfast Lough | Journal | J. Mar. Biol. Assoc. UK | Details... |
3701 references found.