Classification
363 - Other social problems & services
333 - Economics of land & energy
233
330 - Economics
188
320 - Political science
157
610 - Medicine & health
151
551 - Geology, hydrology & meteorology
102
600 - Technology
92
700 - The arts; fine & decorative arts
74
630 - Agriculture & related technologies
63
000 - Computer science, information & general works
57
620 - Engineering & allied operations
54
900 - History & geography
53
140 - Specific philosophical schools
51
380 - Commerce, communications & transportation
50
581 - Specific topics in natural history
46
340 - Law
36
370 - Education
29
628 - Sanitary & municipal engineering
28
500 - Natural sciences & mathematics
26
304 - Factors affecting social behavior
25
580 - Plants (Botany)
22
576 - Genetics & evolution
18
658 - General management
17
170 - Ethics
12
300 - Social sciences
11
720 - Architecture
10
100 - Philosophy & psychology
9
327 - International relations
9
336 - Public finance
9
540 - Chemistry & allied sciences
9
615 - Pharmacology & therapeutics
9
344 - Labor, social, education & cultural law
7
612 - Human physiology
7
800 - Literature & rhetoric
6
400 - Language
5
414 - Phonology & phonetics
5
301 - Sociology & anthropology
4
331 - Labor economics
4
338 - Production
4
361 - Social problems & social welfare in general
3
364 - Criminology
3
530 - Physics
3
550 - Earth sciences
3
657 - Accounting
3
200 - Religion
2
332 - Financial economics
2
360 - Social problems & services; associations
2
520 - Astronomy & allied sciences
2
590 - Animals (Zoology)
2
616 - Diseases
2
more ...