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SDNB
000 Generalities, Science010 Bibliography070 News media, journalismn, publishing220 Bible290 Other & comparative religions350 Public administration370 Education400 Language, Linguistics420 English460 Spanish & Portugese languages500 Natural sciences510 Mathematics520 Astronomy & allied sciences530 Physics560 Paleontology Paleozoology621.3 Electrical Engineering, Electronics793 Indoor games & amusements820 English & Old English literatures830 Literatures of Germanic languages860 Spanish & Portuguese literatures950 General history of Asia Far East