Classification
571 - Physiology & related subjects
655
572 - Biochemistry
323
610 - Medicine & health
279
616 - Diseases
244
530 - Physics
159
620 - Engineering & allied operations
148
612 - Human physiology
147
621 - Applied physics
126
570 - Life sciences; biology
111
541 - Physical chemistry
70
500 - Natural sciences & mathematics
69
615 - Pharmacology & therapeutics
67
333 - Economics of land & energy
66
543 - Analytical chemistry
66
600 - Technology
49
617 - Surgery & related medical specialties
49
006 - Special computer methods
47
577 - Ecology
41
660 - Chemical engineering
40
580 - Plants (Botany)
37
579 - Microorganisms, fungi & algae
32
630 - Agriculture & related technologies
32
540 - Chemistry & allied sciences
31
330 - Economics
29
363 - Other social problems & services
28
000 - Computer science, information & general works
25
539 - Modern physics
25
547 - Organic chemistry
22
700 - The arts; fine & decorative arts
21
551 - Geology, hydrology & meteorology
19
576 - Genetics & evolution
19
910 - Geography & travel
19
590 - Animals (Zoology)
18
611 - Human anatomy, cytology & histology
18
536 - Heat
17
003 - Systems
15
537 - Electricity & electronics
14
001 - Knowledge
13
534 - Sound & related vibrations
13
535 - Light & infrared & ultraviolet phenomena
13
618 - Gynecology, obstetrics, pediatrics & geriatrics
13
634 - Orchards, fruits & forestry
13
300 - Social sciences
12
004 - Data processing & computer science
11
613 - Personal health & safety
11
573 - Specific physiological systems in animals
10
581 - Specific topics in natural history
10
304 - Factors affecting social behavior
9
519 - Probabilities & applied mathematics
9
338 - Production
8
more ...