Classification
620 - Engineering & allied operations
500 - Natural sciences & mathematics
1,767
005 - Computer programming, programs & data
949
384 - Communications; telecommunication
465
331 - Labor economics
395
658 - General management
294
000 - Computer science, information & general works
241
004 - Data processing & computer science
237
745 - Decorative arts
189
006 - Special computer methods
174
374 - Adult education
106
600 - Technology
78
330 - Economics
77
621 - Applied physics
66
363 - Other social problems & services
40
900 - History & geography
34
700 - The arts; fine & decorative arts
25
338 - Production
23
302 - Social interaction
21
540 - Chemistry & allied sciences
20
770 - Photography, photographs & computer art
19
381 - Commerce
18
333 - Economics of land & energy
13
510 - Mathematics
12
519 - Probabilities & applied mathematics
11
794 - Indoor games of skill
11
300 - Social sciences
10
629 - Other branches of engineering
10
380 - Commerce, communications & transportation
9
610 - Medicine & health
7
001 - Knowledge
5
140 - Specific philosophical schools
5
303 - Social processes
5
580 - Plants (Botany)
5
778 - Fields & kinds of photography
5
808 - Rhetoric & collections of literature
5
576 - Genetics & evolution
4
650 - Management & auxiliary services
4
660 - Chemical engineering
4
741 - Drawing & drawings
4
800 - Literature & rhetoric
4
025 - Library operations
3
340 - Law
3
364 - Criminology
3
686 - Printing & related activities
3
781 - General principles & musical forms
3
790 - Recreational & performing arts
3
158 - Applied psychology
2
537 - Electricity & electronics
2
541 - Physical chemistry
2
more ...