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  1. By: Welsh Ornithological Society.
    Publication info: [Wales], Welsh Ornithological Society, 2010-
    Holding Institution: Welsh Ornithological Society
  2. By: Welsh Ornithological Society.
    Publication info: Llanwrtyd Wells, Powys, Welsh Ornithological Society,
    Holding Institution: Natural History Museum Library, London
  3. By: Welsh Ornithological Society.
    Publication info: [S.l.], Welsh Ornithological Society,
    Holding Institution: Natural History Museum Library, London