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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| Belfast Naturalists' Field Club | 1920 | Summer Session: Carngaver | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Belfast Naturalists' Field Club | 1920 | Summer Session: Glenoe | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Belfast Naturalists' Field Club | 1920 | Summer Session: Island Mahee, Strangford Lough | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Burkitt, J.P. | 1920 | Bird notes from Co. Fermanagh | Journal | Ir. Nat. | Details... |
| Foster, N.H. | 1920 | Bewick's swan in Co. Down | Journal | Ir. Nat. | Details... |
| Greer, T. | 1920 | Lepidoptera from east Tyrone and elsewhere in 1920 | Journal | Ir. Nat. | Details... |
| Greer, T. | 1920 | The Macro-Lepidoptera of Co. Tyrone | Journal | Ent. | Details... |
| Greer, T. | 1920 | The Macro-Lepidoptera of Co. Tyrone | Journal | Ent. | Details... |
| Greer, T. | 1920 | Some Lepidoptera from east Tyrone in 1919 | Journal | Entomol. Rec. J. Var. | Details... |
| Greeves, J.R.H. | 1920 | Place names of Strangford Lough area | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Malcomson, H.T. | 1920 | Honey buzzard near Belfast | Journal | Ir. Nat. | Details... |
| Malcomson, H.T. | 1920 | Great black-backed gull nesting in Co. Down | Journal | Ir. Nat. | Details... |
| Morrison, R.N. | 1920 | Bewick's swan in Co. Down | Journal | Ir. Nat. | Details... |
| Praeger, R.Ll. | 1920 | Notes on Antrim plants | Journal | Ir. Nat. | Details... |
| Tomlinson, W.J.C. | 1920 | Eryngium maritimum in Co. Derry | Journal | Ir. Nat. | Details... |
| Tomlinson, W.J.C. | 1920 | The quail in Co. Antrim | Journal | Ir. Nat. | Details... |
| Greer, T. | 1920-21 | The Macrolepidoptera of county Tyrone | Journal | Ent. | Details... |
| Greer, T. | 1920-21 | The Macrolepidoptera of county Tyrone | Journal | Ent. | Details... |
| Greer, T. | 1920-21 | The Macrolepidoptera of county Tyrone | Journal | Ent. | Details... |
| Greer, T. | 1920-21 | The Macrolepidoptera of county Tyrone | Journal | Ent. | Details... |
3701 references found.