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SDNB
000 Generalities, Science130 Paranormal phenomena200 Religion300 Social sciences330 Economics380 Commerce, communications, transport400 Language, Linguistics470 Italic Latin520 Astronomy & allied sciences540 Chemistry & allied sciences610 Medical sciences Medicine620 Engineering & allied operations630 Agriculture690 Buildings700 The arts780 Music910 Geography & travel940 General history of Europe950 General history of Asia Far East960 General history of Africa970 General history of North America