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Historical overview of the development of the National Classification
Historical overview of the development of the National Classification of Activities (NKD) 1994 - 2001
Historical overview of the development of the National Classification of Activities (NKD) 2002 - 2007
Historical overview of the development of the National Classification of Activities (NKD) 2008 - 2024
Historical overview of the development of the National Classification of Activities (NKD), from 2025 onwards