Classification
600 - Technology
399
500 - Natural sciences & mathematics
394
610 - Medicine & health
285
330 - Economics
214
005 - Computer programming, programs & data
199
340 - Law
132
320 - Political science
131
006 - Special computer methods
130
304 - Factors affecting social behavior
125
658 - General management
125
621 - Applied physics
102
333 - Economics of land & energy
96
363 - Other social problems & services
66
620 - Engineering & allied operations
63
370 - Education
58
004 - Data processing & computer science
45
616 - Diseases
40
100 - Philosophy & psychology
34
336 - Public finance
34
000 - Computer science, information & general works
33
331 - Labor economics
33
700 - The arts; fine & decorative arts
33
900 - History & geography
28
338 - Production
25
629 - Other branches of engineering
25
302 - Social interaction
23
306 - Culture & institutions
23
342 - Constitutional & administrative law
22
570 - Life sciences; biology
22
300 - Social sciences
21
380 - Commerce, communications & transportation
21
551 - Geology, hydrology & meteorology
19
624 - Civil engineering
19
200 - Religion
18
301 - Sociology & anthropology
15
305 - Social groups
15
571 - Physiology & related subjects
15
630 - Agriculture & related technologies
15
515 - Analysis
14
690 - Buildings
14
003 - Systems
13
374 - Adult education
13
615 - Pharmacology & therapeutics
13
670 - Manufacturing
13
910 - Geography & travel
13
327 - International relations
12
519 - Probabilities & applied mathematics
12
530 - Physics
12
510 - Mathematics
11
650 - Management & auxiliary services
11
more ...