Classification
615 - Pharmacology & therapeutics
791
616 - Diseases
265
610 - Medicine & health
133
614 - Incidence & prevention of disease
70
363 - Other social problems & services
50
612 - Human physiology
42
700 - The arts; fine & decorative arts
30
340 - Law
27
572 - Biochemistry
27
617 - Surgery & related medical specialties
27
628 - Sanitary & municipal engineering
25
580 - Plants (Botany)
22
620 - Engineering & allied operations
20
333 - Economics of land & energy
19
600 - Technology
19
660 - Chemical engineering
18
540 - Chemistry & allied sciences
17
570 - Life sciences; biology
17
571 - Physiology & related subjects
17
664 - Food technology
17
547 - Organic chemistry
16
632 - Plant injuries, diseases & pests
15
330 - Economics
14
641 - Food & drink
11
000 - Computer science, information & general works
10
140 - Specific philosophical schools
10
630 - Agriculture & related technologies
10
320 - Political science
9
611 - Human anatomy, cytology & histology
9
599 - Mammals
8
618 - Gynecology, obstetrics, pediatrics & geriatrics
8
344 - Labor, social, education & cultural law
7
380 - Commerce, communications & transportation
7
543 - Analytical chemistry
7
500 - Natural sciences & mathematics
6
541 - Physical chemistry
6
551 - Geology, hydrology & meteorology
6
577 - Ecology
6
579 - Microorganisms, fungi & algae
6
668 - Technology of other organic products
6
414 - Phonology & phonetics
5
581 - Specific topics in natural history
5
900 - History & geography
5
574 - [Unassigned]
4
613 - Personal health & safety
4
636 - Animal husbandry
4
150 - Psychology
3
338 - Production
3
546 - Inorganic chemistry
3
573 - Specific physiological systems in animals
3
more ...