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SDNB
000 Generalities, Science010 Bibliography060 General organization & museology080 General collections330 Economics333.7 Natural resources, energy and environment350 Public administration420 English439 Other Germanic languages450 Italian, Romanian, Rhaeto-Romanic460 Spanish & Portugese languages480 Hellenic languages Classical Greek491.8 Slavic languages530 Physics621.3 Electrical Engineering, Electronics630 Agriculture650 Management & auxialiary services660 Chemical engineering690 Buildings720 Architecture740 Drawing & decorative arts793 Indoor games & amusements840 Literature of Romance languages950 General history of Asia Far East980 General history of South America990 General history of other areasS School books