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SDNB
000 Generalities, Science050 General serials & their indexes060 General organization & museology080 General collections090 Manuscripts & rare books130 Paranormal phenomena400 Language, Linguistics430 Germanic480 Hellenic languages Classical Greek490 Other languages520 Astronomy & allied sciences540 Chemistry & allied sciences620 Engineering & allied operations621.3 Electrical Engineering, Electronics624 Structural and Environmental Engineering630 Agriculture660 Chemical engineering690 Buildings720 Architecture870 Italic literatures Latin880 Hellenic literatures Classical Greek910 Geography & travel960 General history of Africa