Classification
003 - Systems
349
500 - Natural sciences & mathematics
302
620 - Engineering & allied operations
282
519 - Probabilities & applied mathematics
265
330 - Economics
244
332 - Financial economics
168
658 - General management
163
621 - Applied physics
138
515 - Analysis
122
006 - Special computer methods
108
700 - The arts; fine & decorative arts
105
600 - Technology
96
333 - Economics of land & energy
94
510 - Mathematics
93
000 - Computer science, information & general works
92
530 - Physics
70
629 - Other branches of engineering
59
570 - Life sciences; biology
57
610 - Medicine & health
57
900 - History & geography
57
551 - Geology, hydrology & meteorology
54
576 - Genetics & evolution
48
004 - Data processing & computer science
47
363 - Other social problems & services
46
670 - Manufacturing
46
518 - Numerical analysis
37
005 - Computer programming, programs & data
34
338 - Production
33
612 - Human physiology
32
380 - Commerce, communications & transportation
31
511 - General principles of mathematics
30
300 - Social sciences
29
368 - Insurance
29
531 - Classical mechanics; solid mechanics
23
331 - Labor economics
22
660 - Chemical engineering
22
153 - Mental processes & intelligence
21
140 - Specific philosophical schools
19
512 - Algebra
19
580 - Plants (Botany)
18
381 - Commerce
17
540 - Chemistry & allied sciences
17
532 - Fluid mechanics; liquid mechanics
16
340 - Law
15
384 - Communications; telecommunication
15
577 - Ecology
14
320 - Political science
13
541 - Physical chemistry
13
516 - Geometry
12
302 - Social interaction
11
more ...