| Citation | Norton, A.H. and R.P. Allen 1931 Breeding of the Great Black-backed Gull and Double-crested Cormorant in Maine. Auk 48(4):589-592. |
| DOI / ISBN | |
| Paper URL | |
| Ref. No. | 7030 |
| Language | English |
| Usage | |
| Remarks | |
| Find this reference in | Google Scholar | Scirus | Species used from this reference |
| Cross references |