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SDNB
020 Library & information sciences030 General encyclopedic works070 News media, journalismn, publishing310 General statistics333.7 Natural resources, energy and environment390 Customs, etiquette, folklore500 Natural sciences510 Mathematics580 Botanical sciences621.3 Electrical Engineering, Electronics670 Manufacturing690 Buildings720 Architecture791 Public performances792 Stage presentations793 Indoor games & amusements891.8 Slavic Literature900 History930 History of the ancient world943 General history of Europe Central Europe Germany