Classification
620 - Engineering & allied operations
349
621 - Applied physics
345
004 - Data processing & computer science
245
005 - Computer programming, programs & data
188
600 - Technology
168
331 - Labor economics
130
530 - Physics
107
629 - Other branches of engineering
100
330 - Economics
97
500 - Natural sciences & mathematics
92
006 - Special computer methods
84
658 - General management
83
900 - History & geography
67
000 - Computer science, information & general works
65
616 - Diseases
60
670 - Manufacturing
59
745 - Decorative arts
59
384 - Communications; telecommunication
58
700 - The arts; fine & decorative arts
58
333 - Economics of land & energy
57
300 - Social sciences
39
610 - Medicine & health
36
340 - Law
31
617 - Surgery & related medical specialties
31
380 - Commerce, communications & transportation
30
320 - Political science
27
001 - Knowledge
26
612 - Human physiology
25
374 - Adult education
24
302 - Social interaction
23
338 - Production
23
537 - Electricity & electronics
21
363 - Other social problems & services
20
650 - Management & auxiliary services
20
541 - Physical chemistry
18
580 - Plants (Botany)
17
660 - Chemical engineering
16
140 - Specific philosophical schools
15
003 - Systems
14
540 - Chemistry & allied sciences
14
790 - Recreational & performing arts
14
539 - Modern physics
13
781 - General principles & musical forms
12
158 - Applied psychology
11
519 - Probabilities & applied mathematics
11
364 - Criminology
10
414 - Phonology & phonetics
10
304 - Factors affecting social behavior
9
531 - Classical mechanics; solid mechanics
9
571 - Physiology & related subjects
9
more ...