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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| Webb, W.M. | 1920 | Gilbert White bicentenary: a bird sanctuary as a memorial | Journal | Ir. Nat. | Details... |
| Anon. | 1921 | Recent records of Irish birds | Journal | Ir. Nat. | Details... |
| Burkitt, J.P. | 1921 | The relation of song to the nesting of birds | Journal | Ir. Nat. | Details... |
| Burkitt, J.P. | 1921 | Migration season of the corncrake | Journal | Ir. Nat. | Details... |
| Burkitt, J.P. | 1921 | The wren | Journal | Ir. Nat. | Details... |
| Burkitt, J.P. | 1921 | The relation of song to nesting in birds | Journal | Ir. Nat. | Details... |
| Burkitt, J.P. | 1921 | The song and nesting of birds | Journal | Ir. Nat. | Details... |
| Campbell, D.C. | 1921 | The time of the singing of birds | Journal | Ir. Nat. | Details... |
| Foster, N.H. | 1921 | Return of the golden-crested wren and long-tailed titmouse | Journal | Ir. Nat. | Details... |
| Foster, N.H. | 1921 | Birds' song at Hillsborough, Co. Down | Journal | Ir. Nat. | Details... |
| Greeves, J.R.H. | 1921 | Sea birds | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Harrison, A. | 1921 | Notes on some Irish birds | Journal | Ir. Nat. | Details... |
| Harrison, A. | 1921 | Irish birds | Journal | Ir. Nat. | Details... |
| Hinde, W.H. | 1921 | Records of Irish birds | Journal | Ir. Nat. | Details... |
| May, G.C. | 1921 | Serin in Queen's County | Journal | Ir. Nat. | Details... |
| Moffat, C.B. | 1921 | Review: 'Soaring flight: a simple mechanical solution of the problem' by R. de Villamil | Journal | Ir. Nat. | Details... |
| Pack-Beresford, D.R. | 1921 | Ravens on Howth | Journal | Ir. Nat. | Details... |
| Pack-Beresford, H.D. | 1921 | Woodcock in Dublin | Journal | Ir. Nat. | Details... |
| Praeger, R.Ll. | 1921 | Birds' nests and their fate | Journal | Ir. Nat. | Details... |
| Rait Kerr, H.M. | 1921 | Lesser whitethroat in Co. Dublin | Journal | Ir. Nat. | Details... |
2846 references found.