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SDNB
000 Generalities, Science004 Data processing Computer sciences090 Manuscripts & rare books130 Paranormal phenomena200 Religion220 Bible310 General statistics350 Public administration490 Other languages550 Earth sciences560 Paleontology Paleozoology600 Technology (Applied sciences)620 Engineering & allied operations621.3 Electrical Engineering, Electronics630 Agriculture770 Photography & photographs791 Public performances914.3 Geography & travel Germany920 Biography, genealogy, insignia930 History of the ancient world990 General history of other areas