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SDNB
000 Generalities, Science030 General encyclopedic works060 General organization & museology100 Philosophy150 Psychology330 Economics390 Customs, etiquette, folklore400 Language, Linguistics450 Italian, Romanian, Rhaeto-Romanic491.8 Slavic languages500 Natural sciences550 Earth sciences560 Paleontology Paleozoology624 Structural and Environmental Engineering660 Chemical engineering690 Buildings780 Music793 Indoor games & amusements800 Literature & rhetoric900 History943 General history of Europe Central Europe Germany950 General history of Asia Far East970 General history of North America990 General history of other areas