Classification
620 - Engineering & allied operations
600 - Technology
54
700 - The arts; fine & decorative arts
39
900 - History & geography
36
000 - Computer science, information & general works
29
333 - Economics of land & energy
26
500 - Natural sciences & mathematics
23
363 - Other social problems & services
19
380 - Commerce, communications & transportation
17
610 - Medicine & health
14
330 - Economics
12
658 - General management
12
005 - Computer programming, programs & data
10
580 - Plants (Botany)
10
576 - Genetics & evolution
8
530 - Physics
7
630 - Agriculture & related technologies
7
140 - Specific philosophical schools
6
370 - Education
6
510 - Mathematics
6
519 - Probabilities & applied mathematics
6
340 - Law
4
551 - Geology, hydrology & meteorology
4
720 - Architecture
4
320 - Political science
3
540 - Chemistry & allied sciences
3
670 - Manufacturing
3
001 - Knowledge
2
004 - Data processing & computer science
2
006 - Special computer methods
2
100 - Philosophy & psychology
2
300 - Social sciences
2
331 - Labor economics
2
384 - Communications; telecommunication
2
621 - Applied physics
2
622 - Mining & related operations
2
628 - Sanitary & municipal engineering
2
629 - Other branches of engineering
2
657 - Accounting
2
800 - Literature & rhetoric
2
003 - Systems
1
153 - Mental processes & intelligence
1
302 - Social interaction
1
332 - Financial economics
1
361 - Social problems & social welfare in general
1
381 - Commerce
1
388 - Transportation; ground transportation
1
400 - Language
1
526 - Mathematical geography
1
541 - Physical chemistry
1
more ...