Classification
006 - Special computer methods
3,218
621 - Applied physics
2,063
004 - Data processing & computer science
827
600 - Technology
663
005 - Computer programming, programs & data
527
770 - Photography, photographs & computer art
492
500 - Natural sciences & mathematics
418
620 - Engineering & allied operations
382
610 - Medicine & health
284
000 - Computer science, information & general works
208
629 - Other branches of engineering
173
003 - Systems
134
700 - The arts; fine & decorative arts
119
519 - Probabilities & applied mathematics
110
616 - Diseases
104
515 - Analysis
93
900 - History & geography
93
302 - Social interaction
85
910 - Geography & travel
76
333 - Economics of land & energy
62
534 - Sound & related vibrations
58
510 - Mathematics
51
520 - Astronomy & allied sciences
50
771 - Techniques, equipment & materials
44
570 - Life sciences; biology
42
530 - Physics
39
775 - Digital photography
39
518 - Numerical analysis
38
778 - Fields & kinds of photography
37
580 - Plants (Botany)
35
331 - Labor economics
33
363 - Other social problems & services
31
330 - Economics
29
670 - Manufacturing
28
745 - Decorative arts
27
025 - Library operations
26
140 - Specific philosophical schools
26
380 - Commerce, communications & transportation
26
551 - Geology, hydrology & meteorology
24
658 - General management
23
001 - Knowledge
22
630 - Agriculture & related technologies
22
571 - Physiology & related subjects
21
340 - Law
20
612 - Human physiology
20
511 - General principles of mathematics
19
550 - Earth sciences
19
400 - Language
18
777 - [Unassigned]
18
414 - Phonology & phonetics
16
more ...