Classification
610 - Medicine & health
304 - Factors affecting social behavior
114
330 - Economics
68
320 - Political science
37
900 - History & geography
35
370 - Education
25
700 - The arts; fine & decorative arts
24
333 - Economics of land & energy
21
300 - Social sciences
20
363 - Other social problems & services
20
380 - Commerce, communications & transportation
17
340 - Law
16
140 - Specific philosophical schools
15
100 - Philosophy & psychology
13
600 - Technology
13
000 - Computer science, information & general works
11
170 - Ethics
10
306 - Culture & institutions
9
200 - Religion
8
630 - Agriculture & related technologies
7
800 - Literature & rhetoric
7
301 - Sociology & anthropology
6
576 - Genetics & evolution
6
551 - Geology, hydrology & meteorology
4
580 - Plants (Botany)
4
620 - Engineering & allied operations
4
362 - Social welfare problems & services
3
400 - Language
3
360 - Social problems & services; associations
2
410 - Linguistics
2
581 - Specific topics in natural history
2
616 - Diseases
2
658 - General management
2
174 - Occupational ethics
1
241 - Christian ethics
1
284 - Protestants of Continental origin
1
338 - Production
1
361 - Social problems & social welfare in general
1
398 - Folklore
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
614 - Incidence & prevention of disease
1
615 - Pharmacology & therapeutics
1
617 - Surgery & related medical specialties
1
618 - Gynecology, obstetrics, pediatrics & geriatrics
1
629 - Other branches of engineering
1
780 - Music
1
830 - Literatures of Germanic languages
1