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Gordon L. Warrick: cliff swallow building nest
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Gordon L. Warrick: cliff swallows in nests
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Gordon L. Warrick: violet-green swallow male
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Gordon L. Warrick: bank swallows at nest cavities
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Gordon L. Warrick: violet-green swallow male
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Gordon L. Warrick: barn swallow male with mud for nest
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Gordon L. Warrick: barn swallow
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Gordon L. Warrick: barn swallow with mud for nest
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Gordon L. Warrick: barn swallow