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SDNB
000 Generalities, Science004 Data processing Computer sciences050 General serials & their indexes333.7 Natural resources, energy and environment460 Spanish & Portugese languages480 Hellenic languages Classical Greek491.8 Slavic languages520 Astronomy & allied sciences610 Medical sciences Medicine621.3 Electrical Engineering, Electronics640 Home economics & family living850 Italian, Romanian, Rhaeto-Romanic literatures860 Spanish & Portuguese literatures900 History914.3 Geography & travel Germany920 Biography, genealogy, insignia950 General history of Asia Far East990 General history of other areasS School books