Classification
571 - Physiology & related subjects
658
572 - Biochemistry
325
610 - Medicine & health
281
616 - Diseases
244
530 - Physics
160
620 - Engineering & allied operations
149
612 - Human physiology
146
621 - Applied physics
126
570 - Life sciences; biology
112
541 - Physical chemistry
70
333 - Economics of land & energy
69
500 - Natural sciences & mathematics
69
615 - Pharmacology & therapeutics
68
543 - Analytical chemistry
66
600 - Technology
51
006 - Special computer methods
50
617 - Surgery & related medical specialties
48
660 - Chemical engineering
40
577 - Ecology
39
580 - Plants (Botany)
38
540 - Chemistry & allied sciences
32
579 - Microorganisms, fungi & algae
32
630 - Agriculture & related technologies
32
330 - Economics
30
363 - Other social problems & services
30
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
590 - Animals (Zoology)
19
910 - Geography & travel
19
611 - Human anatomy, cytology & histology
18
536 - Heat
17
003 - Systems
15
537 - Electricity & electronics
14
634 - Orchards, fruits & forestry
14
001 - Knowledge
13
534 - Sound & related vibrations
13
535 - Light & infrared & ultraviolet phenomena
13
618 - Gynecology, obstetrics, pediatrics & geriatrics
13
300 - Social sciences
12
004 - Data processing & computer science
11
581 - Specific topics in natural history
11
613 - Personal health & safety
11
304 - Factors affecting social behavior
10
573 - Specific physiological systems in animals
10
519 - Probabilities & applied mathematics
9
380 - Commerce, communications & transportation
8
more ...