616 - Diseases 3,241
612 - Human physiology 2,775
614 - Incidence & prevention of disease 2,092
613 - Personal health & safety 2,023
615 - Pharmacology & therapeutics 1,254
610 - Medicine & health 722
617 - Surgery & related medical specialties 716
362 - Social welfare problems & services 606
301 - Sociology & anthropology 510
618 - Gynecology, obstetrics, pediatrics & geriatrics 438
155 - Differential & developmental psychology 409
796 - Athletic & outdoor sports & games 331
574 - [Unassigned] 313
152 - Perception, movement, emotions & drives 294
611 - Human anatomy, cytology & histology 286
628 - Sanitary & municipal engineering 285
591 - Specific topics in natural history 281
157 - [Unassigned] 257
363 - Other social problems & services 239
620 - Engineering & allied operations 167
509 - Historical, geographic & persons treatment 141
660 - Chemical engineering 138
629 - Other branches of engineering 120
658 - General management 102
338 - Production 100
333 - Economics of land & energy 99
371 - Schools & their activities; special education 95
344 - Labor, social, education & cultural law 92
547 - Organic chemistry 90
158 - Applied psychology 87
551 - Geology, hydrology & meteorology 86
153 - Mental processes & intelligence 85
573 - Specific physiological systems in animals 85
361 - Social problems & social welfare in general 78
364 - Criminology 68
150 - Psychology 67
621 - Applied physics 65
375 - Curricula 64
331 - Labor economics 51
711 - Area planning 47
599 - Mammals 45
354 - Administration of economy & environment 43
664 - Food technology 43
154 - Subconscious & altered states 42
174 - Occupational ethics 38
372 - Elementary education 37
330 - Economics 36
641 - Food & drink 36
312 - [Unassigned] 35
519 - Probabilities & applied mathematics 34
668 - Technology of other organic products 33
001 - Knowledge 31
309 - [Unassigned] 30
589 - [Unassigned] 30
797 - Aquatic & air sports 30
576 - Genetics & evolution 28
370 - Education 26
661 - Industrial chemicals 26
394 - General customs 25
388 - Transportation; ground transportation 24
595 - Arthropods 24
352 - General considerations of public administration 22
725 - Public structures 22
179 - Other ethical norms 21
575 - Specific parts of & systems in plants 21
016 - Bibliographies of works on specific subjects 20
541 - Physical chemistry 20
793 - Indoor games & amusements 20
006 - Special computer methods 19
339 - Macroeconomics & related topics 19
627 - Hydraulic engineering 19
790 - Recreational & performing arts 19
341 - Law of nations 18
401 - Philosophy & theory 17
631 - Techniques, equipment & materials 17
544 - [Unassigned] 16
581 - Specific topics in natural history 16
619 - [Unassigned] 16
693 - Specific materials & purposes 16
380 - Commerce, communications & transportation 15
535 - Light & infrared & ultraviolet phenomena 15
649 - Child rearing & home care of persons 15
697 - Heating, ventilating & air-conditioning 15
350 - Public administration & military science 14
387 - Water, air & space transportation 14
534 - Sound & related vibrations 13
546 - Inorganic chemistry 13
572 - Biochemistry 13
636 - Animal husbandry 13
176 - Ethics of sex & reproduction 12
353 - Specific fields of public administration 12
355 - Military science 12
942 - England & Wales 12
632 - Plant injuries, diseases & pests 11
543 - Analytical chemistry 10
596 - Chordates 10
156 - Comparative psychology 9
300 - Social sciences 9
378 - Higher education 9
414 - Phonology & phonetics 9