Classification
370 - Education
610 - Medicine & health
145
330 - Economics
21
380 - Commerce, communications & transportation
16
700 - The arts; fine & decorative arts
12
620 - Engineering & allied operations
10
600 - Technology
8
361 - Social problems & social welfare in general
7
500 - Natural sciences & mathematics
7
000 - Computer science, information & general works
6
540 - Chemistry & allied sciences
6
576 - Genetics & evolution
5
580 - Plants (Botany)
5
100 - Philosophy & psychology
4
362 - Social welfare problems & services
4
363 - Other social problems & services
4
612 - Human physiology
4
900 - History & geography
4
170 - Ethics
3
331 - Labor economics
3
305 - Social groups
2
371 - Schools & their activities; special education
2
372 - Elementary education
2
400 - Language
2
507 - Education, research & related topics
2
616 - Diseases
2
140 - Specific philosophical schools
1
174 - Occupational ethics
1
300 - Social sciences
1
333 - Economics of land & energy
1
340 - Law
1
570 - Life sciences; biology
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
658 - General management
1
660 - Chemical engineering
1