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SDNB
004 Data processing Computer sciences030 General encyclopedic works150 Psychology333.7 Natural resources, energy and environment360 Social services, association370 Education491.8 Slavic languages510 Mathematics620 Engineering & allied operations621.3 Electrical Engineering, Electronics660 Chemical engineering670 Manufacturing740 Drawing & decorative arts780 Music840 Literature of Romance languages900 History910 Geography & travel914.3 Geography & travel Germany930 History of the ancient world940 General history of Europe943 General history of Europe Central Europe Germany