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    3. IFN was created 40 years ago to give information on the French forest ressource and its evolution in time. Ecological data are collected since 1992. Small diameter class : 10 cm (7,5 to 12,5 cm in diameter at 1,30 m) Medium diameter class : 25 cm (12,5 to 37,5 cm) Big diameter class : 50 cm ( > 37,5 cm) IFN was created 40 years ago to give information on the French forest ressource and its evolution in time. Ecological data are collected since 1992. Small diameter class : 10 cm (7,5 to 12,5 cm in diameter at 1,30 m) Medium diameter class : 25 cm (12,5 to 37,5 cm) Big diameter class : 50 cm ( > 37,5 cm)

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