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J. Derr: Prothonotary Warbler
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J. Derr: Worm-eating Warbler
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J. Derr: Nashville Warbler
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J. Derr: Black-throated Green Warbler
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J. Derr: Canada Warbler
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J. Derr: Palm Warbler
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J. Derr: Cape May Warbler
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J. Derr: Blackburnian Warbler
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J. Derr: Blackburnian Warbler
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J. Derr: Yellow-rumped Warbler
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J. Derr: Cerulean Warbler
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J. Derr: Cape May Warbler
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J. Derr: Prothonotary Warbler
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J. Derr: Mourning Warbler
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J. Derr: Bay-breasted Warbler
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J. Derr: American Redstart
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J. Derr: Northern Waterthrush
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J. Derr: Wilson's Warbler
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J. Derr: Magnolia Warbler
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J. Derr: Blackburnian Warbler
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J. Derr: Chestnut-sided Warbler
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J. Derr: Cape May Warbler
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J. Derr: Black-throated Blue Warbler - female
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J. Derr: Connecticut Warbler
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J. Derr: Connecticut Warbler
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J. Derr: Connecticut Warbler
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J. Derr: Palm Warbler