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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| O'Gorman, F. | 1965 | Second record of Natterer's bat, Myotis nattereri (Kuhl.) in Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Keefe, T.G. | 1976 | Bat records from Co. Cork and Co. Limerick | Journal | Ir. Nat. J. | Details... |
| O'Leary, E.M., Sleeman, D.P. & Harrison, S. | 2006 | Diet of urban otters Lutra lutra (L.) | Journal | Ir. Nat. J. | Details... |
| O'Mahony, A. | 1974 | Neotinea intacta (Link.) Reichb. Frat. in Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Mahony, A. | 1975 | First county and vice-county records for Cork plants | Journal | Ir. Nat. J. | Details... |
| O'Mahony, A. | 1976 | Carex depauperata Curt. in NE Cork (H5) a sedge new to Ireland | Journal | Ir. Nat. J. | Details... |
| O'Mahony, A. | 1979 | Inula crithmoides L. and Trifolium striatum L. in the Cork area | Journal | Bull. Ir. biogeog. Soc. | Details... |
| O'Mahony, A. | 1986 | Carex muricata L. subsp. lamprocarpa Celak in the Cork flora: some recent records and autoecological observations | Journal | Ir. Nat. J. | Details... |
| O'Mahony, A. | 1986 | Some recent additions to the Cork flora | Journal | Ir. Nat. J. | Details... |
| O'Mahony, A. | 1986 | Recent records for rare Cork plants | Journal | Bull. Ir. biogeog. Soc. | Details... |
| O'Mahony, A. | 1989 | Carex divulsa Stokes x C. muricata L. occurring as a spontaneous garden hybrid and wild plant in Cork, new to Ireland | Journal | Ir. Nat. J. | Details... |
| O'Mahony, A. & Scannell, M.J.P. | 1977 | BSBI field meeting, Kinsale, Co. Cork, 22-23 May, 1976 | Journal | Ir. Nat. J. | Details... |
| O'Mahony, K. | 1948 | Summer snowflake in Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Regan, B. | 1950 | Black-winged stilt in Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Regan, B. | 1950 | Leach's fork-tailed petrels in Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Regan, B. | 1958 | Little egrets, Egretta garzetta, in Ireland in 1957 in Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Reilly, H. | 1955 | Survey of the Gearagh, an area of wet woodland on the river Lee, near Macroom, Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Riordan, S.P. | 1934 | Rock-cut souterrain at Brackcloon, Castletown Bere, Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Rourke, F.J. | 1955 | Bombus pratorum L. in County Cork | Journal | Ir. Nat. J. | Details... |
| O'Rourke, F.J. | 1962 | The twaite shad in Cork Harbour | Journal | Ir. Nat. J. | Details... |
664 references found.