Classification
330 - Economics
572
610 - Medicine & health
119
333 - Economics of land & energy
55
306 - Culture & institutions
54
363 - Other social problems & services
53
700 - The arts; fine & decorative arts
52
140 - Specific philosophical schools
48
370 - Education
41
100 - Philosophy & psychology
36
600 - Technology
35
000 - Computer science, information & general works
32
320 - Political science
27
658 - General management
25
380 - Commerce, communications & transportation
23
620 - Engineering & allied operations
20
900 - History & geography
19
300 - Social sciences
16
500 - Natural sciences & mathematics
13
580 - Plants (Botany)
13
361 - Social problems & social welfare in general
12
551 - Geology, hydrology & meteorology
12
158 - Applied psychology
11
581 - Specific topics in natural history
11
170 - Ethics
10
150 - Psychology
9
304 - Factors affecting social behavior
9
331 - Labor economics
9
340 - Law
9
200 - Religion
8
720 - Architecture
8
338 - Production
7
362 - Social welfare problems & services
7
780 - Music
7
155 - Differential & developmental psychology
6
301 - Sociology & anthropology
6
305 - Social groups
6
612 - Human physiology
6
613 - Personal health & safety
6
650 - Management & auxiliary services
6
630 - Agriculture & related technologies
5
302 - Social interaction
4
400 - Language
4
360 - Social problems & services; associations
3
520 - Astronomy & allied sciences
3
800 - Literature & rhetoric
3
174 - Occupational ethics
2
179 - Other ethical norms
2
303 - Social processes
2
307 - Communities
2
339 - Macroeconomics & related topics
2
more ...