Classification
658 - General management
380
330 - Economics
175
620 - Engineering & allied operations
133
300 - Social sciences
69
500 - Natural sciences & mathematics
69
005 - Computer programming, programs & data
65
000 - Computer science, information & general works
62
363 - Other social problems & services
58
670 - Manufacturing
54
338 - Production
53
610 - Medicine & health
43
700 - The arts; fine & decorative arts
39
302 - Social interaction
38
331 - Labor economics
38
333 - Economics of land & energy
38
600 - Technology
38
551 - Geology, hydrology & meteorology
37
570 - Life sciences; biology
37
621 - Applied physics
36
004 - Data processing & computer science
26
320 - Political science
25
362 - Social welfare problems & services
25
519 - Probabilities & applied mathematics
25
900 - History & geography
21
580 - Plants (Botany)
20
664 - Food technology
19
380 - Commerce, communications & transportation
17
384 - Communications; telecommunication
17
628 - Sanitary & municipal engineering
16
745 - Decorative arts
16
140 - Specific philosophical schools
15
629 - Other branches of engineering
14
006 - Special computer methods
12
510 - Mathematics
12
540 - Chemistry & allied sciences
12
577 - Ecology
12
615 - Pharmacology & therapeutics
11
660 - Chemical engineering
11
153 - Mental processes & intelligence
10
690 - Buildings
10
381 - Commerce
8
641 - Food & drink
8
340 - Law
7
576 - Genetics & evolution
7
616 - Diseases
7
624 - Civil engineering
7
630 - Agriculture & related technologies
7
370 - Education
6
720 - Architecture
6
001 - Knowledge
5
more ...