Classification
330 - Economics
610 - Medicine & health
304 - Factors affecting social behavior
95
333 - Economics of land & energy
56
320 - Political science
51
363 - Other social problems & services
39
700 - The arts; fine & decorative arts
35
370 - Education
32
600 - Technology
24
000 - Computer science, information & general works
22
140 - Specific philosophical schools
22
361 - Social problems & social welfare in general
15
380 - Commerce, communications & transportation
13
551 - Geology, hydrology & meteorology
12
900 - History & geography
12
580 - Plants (Botany)
11
340 - Law
10
620 - Engineering & allied operations
10
658 - General management
10
630 - Agriculture & related technologies
8
720 - Architecture
6
362 - Social welfare problems & services
5
100 - Philosophy & psychology
4
170 - Ethics
4
300 - Social sciences
4
360 - Social problems & services; associations
4
305 - Social groups
3
500 - Natural sciences & mathematics
3
581 - Specific topics in natural history
3
657 - Accounting
3
200 - Religion
2
338 - Production
2
372 - Elementary education
2
550 - Earth sciences
2
780 - Music
2
301 - Sociology & anthropology
1
336 - Public finance
1
350 - Public administration & military science
1
371 - Schools & their activities; special education
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
614 - Incidence & prevention of disease
1