Classification
620 - Engineering & allied operations
658 - General management
500 - Natural sciences & mathematics
405
330 - Economics
342
005 - Computer programming, programs & data
303
331 - Labor economics
173
338 - Production
132
384 - Communications; telecommunication
129
000 - Computer science, information & general works
125
300 - Social sciences
88
745 - Decorative arts
85
302 - Social interaction
70
600 - Technology
69
670 - Manufacturing
68
004 - Data processing & computer science
60
381 - Commerce
49
621 - Applied physics
46
900 - History & geography
40
700 - The arts; fine & decorative arts
34
363 - Other social problems & services
27
380 - Commerce, communications & transportation
25
333 - Economics of land & energy
24
153 - Mental processes & intelligence
23
374 - Adult education
22
006 - Special computer methods
20
510 - Mathematics
17
001 - Knowledge
15
610 - Medicine & health
15
580 - Plants (Botany)
14
650 - Management & auxiliary services
13
519 - Probabilities & applied mathematics
12
576 - Genetics & evolution
12
140 - Specific philosophical schools
11
158 - Applied psychology
11
320 - Political science
9
332 - Financial economics
9
630 - Agriculture & related technologies
9
368 - Insurance
8
370 - Education
7
628 - Sanitary & municipal engineering
7
629 - Other branches of engineering
7
720 - Architecture
6
340 - Law
5
303 - Social processes
4
551 - Geology, hydrology & meteorology
4
791 - Public performances
4
800 - Literature & rhetoric
4
304 - Factors affecting social behavior
3
362 - Social welfare problems & services
3
410 - Linguistics
3
more ...