Classification
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613 - Personal health & safety
6
691 - Building materials
6
301 - Sociology & anthropology
5
572 - Biochemistry
5
624 - Civil engineering
5
650 - Management & auxiliary services
5
364 - Criminology
4
379 - Public policy issues in education
4
418 - Standard usage & applied linguistics
4
501 - Philosophy & theory
4
509 - Historical, geographic & persons treatment
4
516 - Geometry
4
531 - Classical mechanics; solid mechanics
4
541 - Physical chemistry
4
618 - Gynecology, obstetrics, pediatrics & geriatrics
4
664 - Food technology
4
791 - Public performances
4
062 - Organizations in British Isles; in England
3
070 - News media, journalism & publishing
3
155 - Differential & developmental psychology
3
344 - Labor, social, education & cultural law
3
512 - Algebra
3
523 - Specific celestial bodies & phenomena
3
535 - Light & infrared & ultraviolet phenomena
3
543 - Analytical chemistry
3
581 - Specific topics in natural history
3
627 - Hydraulic engineering
3
659 - Advertising & public relations
3
792 - Stage presentations
3
910 - Geography & travel
3
940 - History of Europe
3
040 - [Unassigned]
2
128 - Humankind
2
170 - Ethics
2
321 - Systems of governments & states
2
323 - Civil & political rights
2
339 - Macroeconomics & related topics
2
340 - Law
2
345 - Criminal law
2
351 - Public administration
2
361 - Social problems & social welfare in general
2
500 - Natural sciences & mathematics
2
514 - Topology
2
518 - Numerical analysis
2
534 - Sound & related vibrations
2
536 - Heat
2
576 - Genetics & evolution
2
623 - Military & nautical engineering
2
657 - Accounting
2
700 - The arts; fine & decorative arts
2
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