Classification
610 - Medicine & health
700 - The arts; fine & decorative arts
330 - Economics
39
140 - Specific philosophical schools
30
000 - Computer science, information & general works
24
363 - Other social problems & services
24
320 - Political science
21
333 - Economics of land & energy
20
600 - Technology
20
370 - Education
16
380 - Commerce, communications & transportation
15
551 - Geology, hydrology & meteorology
14
580 - Plants (Botany)
12
658 - General management
11
340 - Law
10
620 - Engineering & allied operations
9
900 - History & geography
9
362 - Social welfare problems & services
6
581 - Specific topics in natural history
6
630 - Agriculture & related technologies
6
100 - Philosophy & psychology
5
304 - Factors affecting social behavior
5
576 - Genetics & evolution
5
170 - Ethics
4
200 - Religion
3
612 - Human physiology
3
720 - Architecture
3
300 - Social sciences
2
306 - Culture & institutions
2
338 - Production
2
360 - Social problems & services; associations
2
361 - Social problems & social welfare in general
2
400 - Language
2
540 - Chemistry & allied sciences
2
550 - Earth sciences
2
800 - Literature & rhetoric
2
301 - Sociology & anthropology
1
302 - Social interaction
1
353 - Specific fields of public administration
1
500 - Natural sciences & mathematics
1
614 - Incidence & prevention of disease
1
770 - Photography, photographs & computer art
1