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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| Colgan, N. | 1903 | The leaf-marking of Arum maculatum | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1903 | Some recent records for the Flora of County Dublin | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1903 | Hieracium sciaphilum in Co. Dublin | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1904 | Further additions to the flora of County Dublin, with notes on some doubtful records | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1904 | Flora of County Dublin | Book | | Details... |
| Colgan, N. | 1905 | Notes on the invertebrate fauna of Skerries, Co. Dublin | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1905 | Artemisia maritima - a new station for Co. Dublin | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1906 | New marine Mollusca for Co. Dublin | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1906 | Orobanche minor in Co. Dublin | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1907 | Contributions to a natural history of Lambay: marine Mollusca | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1907 | Some further additions to the marine Mollusca of Co. Dublin | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1907 | Leaf-pitting in Arum maculatum | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1907 | Polystichum aculeatum in Co. Dublin | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1907 | Phascolion strombi in Dublin Bay | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1908 | Some county Dublin holothurians | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1911 | On the inheritance of pitted leaf-blotchings in Arum maculatum and on floral variations in the species | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1912 | The burnt ground flora of Killiney Hill | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1912 | Cerianthus lloydii and Adamsia palliata on the Dublin coast | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1912 | Chitonactis coronata (Gosse) on the Dublin coast | Journal | Ir. Nat. | Details... |
| Colgan, N. | 1913 | Further notes on the burnt ground flora of Killiney Hill | Journal | Ir. Nat. | Details... |
770 references found.