NATURE OBSERVATION
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BTNATURE STUDIES + NATURAL HISTORY
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UDC502.2
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Descriptor GERNATURBEOBACHTUNG
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Descriptor ENGNATURE OBSERVATION
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Descriptor FREOBSERVATION DE LA NATURE
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Variant GERBEOBACHTUNG/NATURBEOBACHTUNG
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Variant ENGOBSERVATION/NATURE OBSERVATION
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Variant FRENATURE/OBSERVATION DE LA NATURE
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NTANIMAL OBSERVATION, FIELD METHODS AND FIELD EXPERIMENTS (ZOOLOGY)