Classification
610 - Medicine & health
232
330 - Economics
182
005 - Computer programming, programs & data
173
006 - Special computer methods
127
320 - Political science
100
658 - General management
89
304 - Factors affecting social behavior
80
333 - Economics of land & energy
77
363 - Other social problems & services
58
621 - Applied physics
57
620 - Engineering & allied operations
56
370 - Education
47
004 - Data processing & computer science
44
600 - Technology
37
340 - Law
34
331 - Labor economics
32
616 - Diseases
28
700 - The arts; fine & decorative arts
28
500 - Natural sciences & mathematics
27
336 - Public finance
26
338 - Production
23
570 - Life sciences; biology
22
629 - Other branches of engineering
20
100 - Philosophy & psychology
19
551 - Geology, hydrology & meteorology
19
302 - Social interaction
18
380 - Commerce, communications & transportation
16
624 - Civil engineering
15
300 - Social sciences
13
306 - Culture & institutions
13
374 - Adult education
13
515 - Analysis
13
670 - Manufacturing
13
910 - Geography & travel
13
003 - Systems
12
571 - Physiology & related subjects
11
630 - Agriculture & related technologies
11
200 - Religion
10
327 - International relations
10
530 - Physics
10
615 - Pharmacology & therapeutics
10
628 - Sanitary & municipal engineering
10
690 - Buildings
10
809 - History, description & criticism
10
000 - Computer science, information & general works
9
519 - Probabilities & applied mathematics
9
001 - Knowledge
8
301 - Sociology & anthropology
8
341 - Law of nations
8
580 - Plants (Botany)
8
more ...