Classification
001 - Knowledge
4
003 - Systems
10
004 - Data processing & computer science
8
005 - Computer programming, programs & data
15
006 - Special computer methods
16
020 - Library & information sciences
1
050 - General serial publications
1
150 - Psychology
1
153 - Mental processes & intelligence
3
160 - Logic
1
300 - Social sciences
7
302 - Social interaction
1
306 - Culture & institutions
1
330 - Economics
12
331 - Labor economics
1
332 - Financial economics
2
333 - Economics of land & energy
3
353 - Specific fields of public administration
1
363 - Other social problems & services
3
368 - Insurance
1
384 - Communications; telecommunication
3
388 - Transportation; ground transportation
1
500 - Natural sciences & mathematics
12
501 - Philosophy & theory
2
510 - Mathematics
26
511 - General principles of mathematics
3
512 - Algebra
8
515 - Analysis
49
516 - Geometry
4
518 - Numerical analysis
10
519 - Probabilities & applied mathematics
47
520 - Astronomy & allied sciences
5
526 - Mathematical geography
1
530 - Physics
19
531 - Classical mechanics; solid mechanics
7
534 - Sound & related vibrations
2
541 - Physical chemistry
2
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
3
553 - Economic geology
1
570 - Life sciences; biology
5
571 - Physiology & related subjects
1
572 - Biochemistry
1
577 - Ecology
3
580 - Plants (Botany)
1
610 - Medicine & health
1
615 - Pharmacology & therapeutics
1
616 - Diseases
1
620 - Engineering & allied operations
20
621 - Applied physics
12
more ...