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1by Greenwood, J G“...London :British Ornithologists' Club,1893-...”
Published 1980
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2by Greenwood, J G“...London :British Ornithologists' Club,1893-...”
Published 1986
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3by Browning, M R“...London :British Ornithologists' Club,1893-...”
Published 1991
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Article in Journal/Newspaper