Classification
571 - Physiology & related subjects
676
572 - Biochemistry
326
610 - Medicine & health
285
616 - Diseases
249
530 - Physics
162
620 - Engineering & allied operations
157
612 - Human physiology
149
621 - Applied physics
126
570 - Life sciences; biology
118
541 - Physical chemistry
72
333 - Economics of land & energy
70
500 - Natural sciences & mathematics
69
543 - Analytical chemistry
68
615 - Pharmacology & therapeutics
67
600 - Technology
51
617 - Surgery & related medical specialties
49
006 - Special computer methods
47
577 - Ecology
42
660 - Chemical engineering
41
580 - Plants (Botany)
38
579 - Microorganisms, fungi & algae
33
540 - Chemistry & allied sciences
32
630 - Agriculture & related technologies
32
363 - Other social problems & services
31
330 - Economics
29
000 - Computer science, information & general works
25
539 - Modern physics
25
001 - Knowledge
24
300 - Social sciences
23
547 - Organic chemistry
22
700 - The arts; fine & decorative arts
21
551 - Geology, hydrology & meteorology
20
576 - Genetics & evolution
19
590 - Animals (Zoology)
19
910 - Geography & travel
19
536 - Heat
17
003 - Systems
16
611 - Human anatomy, cytology & histology
16
634 - Orchards, fruits & forestry
16
535 - Light & infrared & ultraviolet phenomena
15
537 - Electricity & electronics
14
534 - Sound & related vibrations
13
618 - Gynecology, obstetrics, pediatrics & geriatrics
13
304 - Factors affecting social behavior
12
004 - Data processing & computer science
11
581 - Specific topics in natural history
11
613 - Personal health & safety
11
519 - Probabilities & applied mathematics
10
573 - Specific physiological systems in animals
10
380 - Commerce, communications & transportation
8
more ...