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SDNB
000 Generalities, Science090 Manuscripts & rare books130 Paranormal phenomena200 Religion310 General statistics350 Public administration470 Italic Latin490 Other languages550 Earth sciences560 Paleontology Paleozoology600 Technology (Applied sciences)620 Engineering & allied operations621.3 Electrical Engineering, Electronics630 Agriculture640 Home economics & family living650 Management & auxialiary services720 Architecture770 Photography & photographs914.3 Geography & travel Germany920 Biography, genealogy, insignia990 General history of other areas