Classification
363 - Other social problems & services
333 - Economics of land & energy
241
330 - Economics
197
320 - Political science
174
610 - Medicine & health
153
551 - Geology, hydrology & meteorology
112
600 - Technology
98
700 - The arts; fine & decorative arts
88
630 - Agriculture & related technologies
71
000 - Computer science, information & general works
65
620 - Engineering & allied operations
61
900 - History & geography
58
581 - Specific topics in natural history
52
140 - Specific philosophical schools
50
380 - Commerce, communications & transportation
50
340 - Law
41
370 - Education
29
304 - Factors affecting social behavior
27
500 - Natural sciences & mathematics
27
628 - Sanitary & municipal engineering
26
300 - Social sciences
22
580 - Plants (Botany)
22
576 - Genetics & evolution
18
658 - General management
18
170 - Ethics
14
100 - Philosophy & psychology
12
720 - Architecture
11
327 - International relations
9
336 - Public finance
9
540 - Chemistry & allied sciences
9
615 - Pharmacology & therapeutics
9
800 - Literature & rhetoric
8
612 - Human physiology
7
200 - Religion
6
400 - Language
6
301 - Sociology & anthropology
5
414 - Phonology & phonetics
5
331 - Labor economics
4
338 - Production
4
361 - Social problems & social welfare in general
4
344 - Labor, social, education & cultural law
3
364 - Criminology
3
530 - Physics
3
550 - Earth sciences
3
590 - Animals (Zoology)
3
657 - Accounting
3
332 - Financial economics
2
360 - Social problems & services; associations
2
410 - Linguistics
2
520 - Astronomy & allied sciences
2
more ...