Classification
004 - Data processing & computer science
8,107
005 - Computer programming, programs & data
7,494
500 - Natural sciences & mathematics
5,072
006 - Special computer methods
3,534
620 - Engineering & allied operations
1,786
003 - Systems
990
331 - Labor economics
959
658 - General management
917
519 - Probabilities & applied mathematics
866
621 - Applied physics
786
000 - Computer science, information & general works
758
518 - Numerical analysis
627
384 - Communications; telecommunication
438
745 - Decorative arts
309
330 - Economics
304
511 - General principles of mathematics
238
025 - Library operations
228
530 - Physics
198
510 - Mathematics
182
512 - Algebra
158
515 - Analysis
148
300 - Social sciences
147
570 - Life sciences; biology
147
600 - Technology
141
629 - Other branches of engineering
139
374 - Adult education
132
302 - Social interaction
95
338 - Production
95
700 - The arts; fine & decorative arts
90
670 - Manufacturing
89
610 - Medicine & health
82
650 - Management & auxiliary services
81
381 - Commerce
72
333 - Economics of land & energy
66
303 - Social processes
62
516 - Geometry
57
001 - Knowledge
56
551 - Geology, hydrology & meteorology
51
612 - Human physiology
51
410 - Linguistics
48
371 - Schools & their activities; special education
45
380 - Commerce, communications & transportation
43
332 - Financial economics
39
794 - Indoor games of skill
38
160 - Logic
34
140 - Specific philosophical schools
33
153 - Mental processes & intelligence
33
363 - Other social problems & services
33
576 - Genetics & evolution
31
370 - Education
30
more ...