BIRD WATCHING
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BTANIMAL OBSERVATION, FIELD METHODS AND FIELD EXPERIMENTS (ZOOLOGY)
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UDC59.084*1
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Descriptor GERVOGELBEOBACHTUNG
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Descriptor ENGBIRD WATCHING
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Descriptor FREOBSERVATION DES OISEAUX
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Variant GERBEOBACHTUNG/VOGELBEOBACHTUNG
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Variant ENGWATCHING/BIRD WATCHING
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Variant ENGBIRD OBSERVATIONS
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Variant ENGOBSERVATIONS/BIRD OBSERVATIONS
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Variant FREOISEAUX/OBSERVATION DES OISEAUX
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RTBIRD MIGRATION (ANIMAL ECOLOGY)