Classification
610 - Medicine & health
8,437
330 - Economics
931
700 - The arts; fine & decorative arts
622
363 - Other social problems & services
362
370 - Education
314
600 - Technology
299
100 - Philosophy & psychology
273
140 - Specific philosophical schools
259
380 - Commerce, communications & transportation
200
580 - Plants (Botany)
190
612 - Human physiology
183
170 - Ethics
158
000 - Computer science, information & general works
154
900 - History & geography
147
576 - Genetics & evolution
131
616 - Diseases
101
361 - Social problems & social welfare in general
99
340 - Law
95
362 - Social welfare problems & services
73
800 - Literature & rhetoric
72
620 - Engineering & allied operations
62
333 - Economics of land & energy
58
615 - Pharmacology & therapeutics
58
540 - Chemistry & allied sciences
40
551 - Geology, hydrology & meteorology
30
320 - Political science
25
500 - Natural sciences & mathematics
25
658 - General management
20
613 - Personal health & safety
18
400 - Language
17
614 - Incidence & prevention of disease
16
630 - Agriculture & related technologies
15
200 - Religion
11
581 - Specific topics in natural history
11
300 - Social sciences
9
305 - Social groups
9
618 - Gynecology, obstetrics, pediatrics & geriatrics
9
338 - Production
8
572 - Biochemistry
7
660 - Chemical engineering
7
304 - Factors affecting social behavior
6
331 - Labor economics
6
570 - Life sciences; biology
5
628 - Sanitary & municipal engineering
5
306 - Culture & institutions
4
507 - Education, research & related topics
4
070 - News media, journalism & publishing
3
155 - Differential & developmental psychology
3
174 - Occupational ethics
3
301 - Sociology & anthropology
3
more ...