Classification
001 - Knowledge
23
003 - Systems
2
004 - Data processing & computer science
1
005 - Computer programming, programs & data
4
006 - Special computer methods
38
040 - [Unassigned]
1
061 - Organizations in North America
4
111 - Ontology
1
150 - Psychology
14
155 - Differential & developmental psychology
4
158 - Applied psychology
1
300 - Social sciences
23
301 - Sociology & anthropology
3
304 - Factors affecting social behavior
1
306 - Culture & institutions
1
330 - Economics
2
331 - Labor economics
3
332 - Financial economics
2
333 - Economics of land & energy
2
338 - Production
6
340 - Law
4
341 - Law of nations
1
344 - Labor, social, education & cultural law
1
345 - Criminal law
1
353 - Specific fields of public administration
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
3
418 - Standard usage & applied linguistics
1
500 - Natural sciences & mathematics
2
511 - General principles of mathematics
2
520 - Astronomy & allied sciences
2
530 - Physics
1
531 - Classical mechanics; solid mechanics
1
534 - Sound & related vibrations
1
541 - Physical chemistry
1
543 - Analytical chemistry
1
546 - Inorganic chemistry
1
547 - Organic chemistry
2
550 - Earth sciences
2
551 - Geology, hydrology & meteorology
2
570 - Life sciences; biology
5
571 - Physiology & related subjects
53
572 - Biochemistry
49
573 - Specific physiological systems in animals
2
576 - Genetics & evolution
2
577 - Ecology
23
579 - Microorganisms, fungi & algae
1
580 - Plants (Botany)
5
581 - Specific topics in natural history
1
590 - Animals (Zoology)
3
more ...