Classification
610 - Medicine & health
116
330 - Economics
79
333 - Economics of land & energy
58
363 - Other social problems & services
55
700 - The arts; fine & decorative arts
53
306 - Culture & institutions
52
140 - Specific philosophical schools
51
370 - Education
50
100 - Philosophy & psychology
35
600 - Technology
35
000 - Computer science, information & general works
32
320 - Political science
30
380 - Commerce, communications & transportation
24
658 - General management
23
620 - Engineering & allied operations
21
300 - Social sciences
19
900 - History & geography
17
361 - Social problems & social welfare in general
14
500 - Natural sciences & mathematics
14
580 - Plants (Botany)
13
551 - Geology, hydrology & meteorology
12
581 - Specific topics in natural history
11
158 - Applied psychology
10
170 - Ethics
10
340 - Law
10
305 - Social groups
9
200 - Religion
8
304 - Factors affecting social behavior
8
331 - Labor economics
8
362 - Social welfare problems & services
8
720 - Architecture
8
301 - Sociology & anthropology
7
400 - Language
7
613 - Personal health & safety
7
780 - Music
7
155 - Differential & developmental psychology
6
338 - Production
6
612 - Human physiology
6
650 - Management & auxiliary services
6
150 - Psychology
5
630 - Agriculture & related technologies
5
302 - Social interaction
4
360 - Social problems & services; associations
3
372 - Elementary education
3
520 - Astronomy & allied sciences
3
614 - Incidence & prevention of disease
3
800 - Literature & rhetoric
3
174 - Occupational ethics
2
179 - Other ethical norms
2
303 - Social processes
2
more ...