Classification
330 - Economics
361 - Social problems & social welfare in general
320 - Political science
81
610 - Medicine & health
57
300 - Social sciences
37
333 - Economics of land & energy
28
360 - Social problems & services; associations
26
700 - The arts; fine & decorative arts
24
100 - Philosophy & psychology
19
340 - Law
16
000 - Computer science, information & general works
12
658 - General management
11
140 - Specific philosophical schools
10
380 - Commerce, communications & transportation
10
301 - Sociology & anthropology
9
370 - Education
9
363 - Other social problems & services
8
600 - Technology
8
304 - Factors affecting social behavior
7
170 - Ethics
6
336 - Public finance
6
364 - Criminology
6
650 - Management & auxiliary services
6
900 - History & geography
6
500 - Natural sciences & mathematics
5
350 - Public administration & military science
4
580 - Plants (Botany)
4
630 - Agriculture & related technologies
4
332 - Financial economics
3
338 - Production
3
551 - Geology, hydrology & meteorology
3
620 - Engineering & allied operations
3
200 - Religion
2
331 - Labor economics
2
372 - Elementary education
2
576 - Genetics & evolution
2
615 - Pharmacology & therapeutics
2
001 - Knowledge
1
160 - Logic
1
306 - Culture & institutions
1
371 - Schools & their activities; special education
1
540 - Chemistry & allied sciences
1
612 - Human physiology
1
670 - Manufacturing
1
791 - Public performances
1
800 - Literature & rhetoric
1