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SDNB
000 Generalities, Science050 General serials & their indexes070 News media, journalismn, publishing100 Philosophy220 Bible340 Law420 English500 Natural sciences520 Astronomy & allied sciences530 Physics560 Paleontology Paleozoology621.3 Electrical Engineering, Electronics660 Chemical engineering790 Recreational & performing arts810 American literature in English830 Literatures of Germanic languages891.8 Slavic Literature980 General history of South America