| Citation | Snell, R.R. 2002 Iceland Gull (Larus glaucoides) and Thayer’s Gull (Larus thayeri). Seabirds In Poole, A. and Gill, G. (eds.), The Birds of North America. The Birds of North America, Inc., Philadelphia, PA. 699:. |
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| Ref. No. | 7099 |
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