Literature
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Filters: First Letter Of Title is B and Author is Ewins, Peter J. [Clear All Filters]
, 1985. The breeding distribution of Black Guillemots Cepphus grylle in Orkney and Shetland, 1982–84. Bird Study, 32(3), pp.186 - 193. Available at: https://www.tandfonline.com/doi/abs/10.1080/00063658509476877.