Classification
006 - Special computer methods
3,237
004 - Data processing & computer science
885
005 - Computer programming, programs & data
642
621 - Applied physics
411
610 - Medicine & health
143
003 - Systems
100
620 - Engineering & allied operations
90
629 - Other branches of engineering
86
600 - Technology
72
700 - The arts; fine & decorative arts
59
000 - Computer science, information & general works
55
570 - Life sciences; biology
37
900 - History & geography
37
025 - Library operations
34
519 - Probabilities & applied mathematics
34
910 - Geography & travel
34
333 - Economics of land & energy
33
140 - Specific philosophical schools
28
500 - Natural sciences & mathematics
27
616 - Diseases
27
518 - Numerical analysis
24
630 - Agriculture & related technologies
21
001 - Knowledge
19
371 - Schools & their activities; special education
19
363 - Other social problems & services
17
515 - Analysis
17
330 - Economics
16
580 - Plants (Botany)
16
331 - Labor economics
15
380 - Commerce, communications & transportation
14
510 - Mathematics
12
516 - Geometry
12
658 - General management
12
670 - Manufacturing
12
530 - Physics
10
400 - Language
9
520 - Astronomy & allied sciences
9
551 - Geology, hydrology & meteorology
9
612 - Human physiology
9
576 - Genetics & evolution
8
770 - Photography, photographs & computer art
7
660 - Chemical engineering
6
800 - Literature & rhetoric
6
414 - Phonology & phonetics
5
511 - General principles of mathematics
5
534 - Sound & related vibrations
5
720 - Architecture
5
745 - Decorative arts
5
300 - Social sciences
4
340 - Law
4
more ...