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Srebarna - Bulgaria |
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Black Sea - Bulgaria |
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Sierra Nevada Global-Change Observatory (UGR-JA) - Spain |
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Sozopol - Black Sea - Bulgaria |
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Mesta River - Bulgaria |
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Petrohan-Ponor - Bulgaria |
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Belasitsa - Bulgaria |
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Tenuta di Castelporziano - Italy |
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National Park Hoge Kempen - Belgium |
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Yundola - Bulgaria |
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Livingstone Island - Antarctica |
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