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1. |
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Bird Observatories of Britain and Ireland
Bird Observatories Council Bird Observatories Council, Archer Mike Archer, Grantham Mark Grantham, Howlett Peter Howlett, Stansfield Steven Stansfield
E-bok. Bloomsbury Publishing, Storbritannien, 2010.
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2. |
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Bird Observatories of Britain and Ireland
Bird Observatories Council Bird Observatories Council, Archer Mike Archer, Grantham Mark Grantham, Howlett Peter Howlett, Stansfield Steven Stansfield
E-bok. Bloomsbury Publishing, Storbritannien, 2010.
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