Classification
658 - General management
371
330 - Economics
168
620 - Engineering & allied operations
130
363 - Other social problems & services
87
500 - Natural sciences & mathematics
69
300 - Social sciences
68
005 - Computer programming, programs & data
64
000 - Computer science, information & general works
60
670 - Manufacturing
54
338 - Production
51
551 - Geology, hydrology & meteorology
48
333 - Economics of land & energy
43
610 - Medicine & health
42
621 - Applied physics
41
700 - The arts; fine & decorative arts
39
302 - Social interaction
37
570 - Life sciences; biology
36
600 - Technology
36
331 - Labor economics
35
004 - Data processing & computer science
26
519 - Probabilities & applied mathematics
26
320 - Political science
25
362 - Social welfare problems & services
25
580 - Plants (Botany)
21
900 - History & geography
21
664 - Food technology
19
384 - Communications; telecommunication
17
628 - Sanitary & municipal engineering
17
660 - Chemical engineering
17
380 - Commerce, communications & transportation
16
745 - Decorative arts
16
140 - Specific philosophical schools
15
577 - Ecology
14
629 - Other branches of engineering
14
006 - Special computer methods
12
510 - Mathematics
12
615 - Pharmacology & therapeutics
11
540 - Chemistry & allied sciences
10
690 - Buildings
10
153 - Mental processes & intelligence
9
624 - Civil engineering
9
381 - Commerce
8
641 - Food & drink
8
340 - Law
7
576 - Genetics & evolution
7
616 - Diseases
7
630 - Agriculture & related technologies
7
370 - Education
6
550 - Earth sciences
6
613 - Personal health & safety
6
more ...