Classification
361 - Social problems & social welfare in general
610 - Medicine & health
41
330 - Economics
28
170 - Ethics
9
370 - Education
7
100 - Philosophy & psychology
6
900 - History & geography
6
140 - Specific philosophical schools
4
333 - Economics of land & energy
4
340 - Law
3
362 - Social welfare problems & services
3
363 - Other social problems & services
3
372 - Elementary education
2
306 - Culture & institutions
1
371 - Schools & their activities; special education
1
590 - Animals (Zoology)
1
600 - Technology
1
616 - Diseases
1
620 - Engineering & allied operations
1
660 - Chemical engineering
1
700 - The arts; fine & decorative arts
1