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SDNB
000 Generalities, Science333.7 Natural resources, energy and environment360 Social services, association380 Commerce, communications, transport460 Spanish & Portugese languages480 Hellenic languages Classical Greek500 Natural sciences510 Mathematics621.3 Electrical Engineering, Electronics650 Management & auxialiary services700 The arts839 Other Germanic literatures890 Literatures of other languages891.8 Slavic Literature950 General history of Asia Far East960 General history of AfricaK Children's and youth literatureS School books