Classification
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303 - Social processes
2
305 - Social groups
2
332 - Financial economics
2
365 - Penal & related institutions
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
612 - Human physiology
2
615 - Pharmacology & therapeutics
2
617 - Surgery & related medical specialties
2
620 - Engineering & allied operations
2
650 - Management & auxiliary services
2
820 - English & Old English literatures
2
003 - Systems
1
153 - Mental processes & intelligence
1
179 - Other ethical norms
1
190 - Modern western philosophy
1
261 - Social theology
1
262 - Ecclesiology
1
322 - Relation of state to organized groups
1
352 - General considerations of public administration
1
362 - Social welfare problems & services
1
370 - Education
1
371 - Schools & their activities; special education
1
374 - Adult education
1
384 - Communications; telecommunication
1
400 - Language
1
501 - Philosophy & theory
1
530 - Physics
1
534 - Sound & related vibrations
1
580 - Plants (Botany)
1
600 - Technology
1
613 - Personal health & safety
1
618 - Gynecology, obstetrics, pediatrics & geriatrics
1
629 - Other branches of engineering
1
630 - Agriculture & related technologies
1
641 - Food & drink
1
657 - Accounting
1
664 - Food technology
1
670 - Manufacturing
1
810 - American literature in English
1
823 - English fiction
1
920 - Biography, genealogy & insignia
1
940 - History of Europe
1
956 - Middle East (Near East)
1
961 - Tunisia & Libya
1
962 - Egypt & Sudan
1
967 - Central Africa & offshore islands
1