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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| McLoughlin, T.J.J. & Irwin, S.W.B. | 1991 | The occurrence of eye flukes in fish from the Erne catchment area | Journal | Ir. Nat. J. | Details... |
| Northridge, R.H. | 1991 | Chenopodium capitatum in Co. Fermanagh | Journal | Ir. Nat. J. | Details... |
| Nunn, J.D. | 1991 | Recording Mollusca in Ireland: Ballyhenry Bay, Strangford Lough, Co. Down | Journal | Conch. Newsletter | Details... |
| Phillips, J.C.L. | 1991 | Excursion: Rea's Wood, Antrim | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Portmann, J.E. | 1991 | Second report of the marine pollution monitoring management group's co-ordinating group on monitoring of sewage-sludge disposal sites | Report | | Details... |
| Rippey, I. | 1991 | Records of moths (Lepidoptera) in Northern Ireland, 1990 | Journal | Ir. Nat. J. | Details... |
| Rippey, I. | 1991 | 1990 Butterfly and moth report for Northern Ireland | Report | | Details... |
| Rippey, I. & Webb, D.A. | 1991 | Cranberry Vaccinium oxycoccus L. in Co. Down | Journal | Ir. Nat. J. | Details... |
| RSPB | 1991 | Castlecaldwell Annual Report | Report | | Details... |
| RSPB | 1991 | Rathlin Island Cliffs Annual Report | Report | | Details... |
| RSPB | 1991 | Swan Island Annual Report | Report | | Details... |
| Russell, B. | 1991 | Excursion: Scawt Hill | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Russell, B. | 1991 | Excursion: North Antrim Weekend: geological | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Russell, B.W. | 1991 | Excursion: Geology of the Carrickfergus area | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Smith, A.G. & Goddard, I.C. | 1991 | A 12500 year record of vegetational history at Sluggan Bog, Co. Antrim, N. Ireland (incorporating a pollen zone scheme for the non-specialist) | Journal | New Phytol. | Details... |
| Smith, R.A., Johnston, T.P. & Legg, I.C. | 1991 | Geology of the country around Newtownards | Book | | Details... |
| Smith, S.J., Wolfe-Murphy, S.A., Enlander, I. & Gibson, C.E. | 1991 | The lakes of Northern Ireland: an annotated inventory | Book | | Details... |
| Toal, L. | 1991 | Merlin survey data for Northern Ireland | Unpublished | | Details... |
| Ulster Wildlife Trust | 1991 | Laganlife - consultancy report on the development of Laganside | Report | | Details... |
| Wilde, J. | 1991 | x Dactyloglossum mixtum (Aschers & Graebn) P.F. Hunt in Co. Down | Journal | Ir. Nat. J. | Details... |
3701 references found.