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SDNB
000 Generalities, Science070 News media, journalismn, publishing150 Psychology200 Religion230 Christian theology320 Political science360 Social services, association520 Astronomy & allied sciences570 Life science600 Technology (Applied sciences)620 Engineering & allied operations630 Agriculture800 Literature & rhetoric839 Other Germanic literatures891.8 Slavic Literature930 History of the ancient world980 General history of South America