Classification
330 - Economics
610 - Medicine & health
441
700 - The arts; fine & decorative arts
69
600 - Technology
62
140 - Specific philosophical schools
38
361 - Social problems & social welfare in general
27
370 - Education
21
170 - Ethics
13
363 - Other social problems & services
12
340 - Law
11
100 - Philosophy & psychology
10
658 - General management
10
900 - History & geography
9
362 - Social welfare problems & services
8
580 - Plants (Botany)
8
333 - Economics of land & energy
7
338 - Production
5
380 - Commerce, communications & transportation
5
551 - Geology, hydrology & meteorology
5
305 - Social groups
4
540 - Chemistry & allied sciences
4
616 - Diseases
4
620 - Engineering & allied operations
4
320 - Political science
3
576 - Genetics & evolution
3
615 - Pharmacology & therapeutics
3
800 - Literature & rhetoric
3
200 - Religion
2
301 - Sociology & anthropology
2
368 - Insurance
2
372 - Elementary education
2
500 - Natural sciences & mathematics
2
630 - Agriculture & related technologies
2
657 - Accounting
2
000 - Computer science, information & general works
1
300 - Social sciences
1
306 - Culture & institutions
1
331 - Labor economics
1
353 - Specific fields of public administration
1
371 - Schools & their activities; special education
1
581 - Specific topics in natural history
1
612 - Human physiology
1
614 - Incidence & prevention of disease
1