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Islands at John Heinz national wildlife refuge.jpg
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Panther swamp national wildlife refuge Mississippi.jpg
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Children are pictured looking for birds at the john heinz national wildlife refuge at tinicum.jpg
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Lee Metcalf national reserve Stevensville Montana.jpg
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Employee monitors a gas line.jpg
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Steller sea lions in water.jpg
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Pumping station on river.jpg
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Huge salt marshes surrounding San Diego bay.jpg
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