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Upon the tree-tops - Beard, J. Carter (James, Carter), 1837 -1913 (Houghton, Mifflin and company, 1897)

Upon the tree-tops - Beard, J. Carter (James, Carter), 1837 -1913 (Houghton, Mifflin and company, 1897)

Upon the tree-tops - Beard, J. Carter (James, Carter), 1837 -1913 (Houghton, Mifflin and company, 1897)

Upon the tree-tops - Beard, J. Carter (James, Carter), 1837 -1913 (Houghton, Mifflin and company, 1897)

Upon the tree-tops - Beard, J. Carter (James, Carter), 1837 -1913 (Houghton, Mifflin and company, 1897)

Upon the tree-tops - Beard, J. Carter (James, Carter), 1837 -1913 (Houghton, Mifflin and company, 1897)

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The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1935)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1935)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1936)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1943)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1946)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1946)

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The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 2005)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 2005)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 2005)

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World Checklist of Threatened Birds (1990)

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World Checklist of Threatened Birds (1990)

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