Classification
005 - Computer programming, programs & data
494
006 - Special computer methods
296
620 - Engineering & allied operations
203
004 - Data processing & computer science
195
621 - Applied physics
173
330 - Economics
152
658 - General management
121
003 - Systems
104
519 - Probabilities & applied mathematics
96
500 - Natural sciences & mathematics
87
530 - Physics
66
300 - Social sciences
63
040 - [Unassigned]
59
616 - Diseases
58
551 - Geology, hydrology & meteorology
56
331 - Labor economics
53
518 - Numerical analysis
51
610 - Medicine & health
50
001 - Knowledge
45
629 - Other branches of engineering
43
338 - Production
37
577 - Ecology
37
571 - Physiology & related subjects
36
670 - Manufacturing
34
332 - Financial economics
32
384 - Communications; telecommunication
30
520 - Astronomy & allied sciences
30
572 - Biochemistry
28
541 - Physical chemistry
27
333 - Economics of land & energy
24
510 - Mathematics
24
745 - Decorative arts
23
515 - Analysis
22
612 - Human physiology
22
025 - Library operations
21
550 - Earth sciences
21
302 - Social interaction
20
304 - Factors affecting social behavior
20
539 - Modern physics
19
624 - Civil engineering
19
000 - Computer science, information & general works
18
523 - Specific celestial bodies & phenomena
18
570 - Life sciences; biology
18
531 - Classical mechanics; solid mechanics
17
511 - General principles of mathematics
14
301 - Sociology & anthropology
12
363 - Other social problems & services
12
512 - Algebra
12
576 - Genetics & evolution
12
690 - Buildings
12
more ...