Classification
000 - Computer science, information & general works
37
001 - Knowledge
1
100 - Philosophy & psychology
8
140 - Specific philosophical schools
21
150 - Psychology
1
174 - Occupational ethics
1
300 - Social sciences
3
304 - Factors affecting social behavior
1
306 - Culture & institutions
62
320 - Political science
1
330 - Economics
29
331 - Labor economics
1
333 - Economics of land & energy
31
338 - Production
2
340 - Law
3
353 - Specific fields of public administration
1
355 - Military science
1
361 - Social problems & social welfare in general
6
362 - Social welfare problems & services
12
363 - Other social problems & services
14
365 - Penal & related institutions
1
370 - Education
11
371 - Schools & their activities; special education
1
372 - Elementary education
2
380 - Commerce, communications & transportation
25
394 - General customs
1
400 - Language
2
414 - Phonology & phonetics
5
500 - Natural sciences & mathematics
4
509 - Historical, geographic & persons treatment
1
519 - Probabilities & applied mathematics
1
530 - Physics
1
540 - Chemistry & allied sciences
10
551 - Geology, hydrology & meteorology
9
576 - Genetics & evolution
8
580 - Plants (Botany)
25
581 - Specific topics in natural history
4
590 - Animals (Zoology)
1
600 - Technology
25
610 - Medicine & health
612 - Human physiology
6
613 - Personal health & safety
3
614 - Incidence & prevention of disease
4
615 - Pharmacology & therapeutics
5
616 - Diseases
10
618 - Gynecology, obstetrics, pediatrics & geriatrics
7
620 - Engineering & allied operations
26
629 - Other branches of engineering
1
630 - Agriculture & related technologies
8
658 - General management
4
more ...