| Referens | 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 | |
| Artikelns URL | |
| Ref. No. | 7030 |
| Språk | English |
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| Sök denna referens i | Google Scholar | Scirus | Species used from this reference |
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