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SDNB
000 Generalities, Science004 Data processing Computer sciences010 Bibliography300 Social sciences335 Military science390 Customs, etiquette, folklore460 Spanish & Portugese languages480 Hellenic languages Classical Greek510 Mathematics550 Earth sciences650 Management & auxialiary services810 American literature in English839 Other Germanic literatures870 Italic literatures Latin880 Hellenic literatures Classical Greek900 History910 Geography & travel920 Biography, genealogy, insignia980 General history of South America990 General history of other areas