Classification
363 - Other social problems & services
333 - Economics of land & energy
258
330 - Economics
216
320 - Political science
195
610 - Medicine & health
157
551 - Geology, hydrology & meteorology
117
600 - Technology
103
700 - The arts; fine & decorative arts
101
630 - Agriculture & related technologies
81
000 - Computer science, information & general works
65
620 - Engineering & allied operations
63
900 - History & geography
62
380 - Commerce, communications & transportation
57
581 - Specific topics in natural history
55
140 - Specific philosophical schools
53
340 - Law
43
370 - Education
34
628 - Sanitary & municipal engineering
30
300 - Social sciences
29
304 - Factors affecting social behavior
29
500 - Natural sciences & mathematics
27
580 - Plants (Botany)
22
576 - Genetics & evolution
18
658 - General management
18
170 - Ethics
14
100 - Philosophy & psychology
13
327 - International relations
12
720 - Architecture
11
336 - Public finance
9
540 - Chemistry & allied sciences
9
615 - Pharmacology & therapeutics
9
800 - Literature & rhetoric
8
301 - Sociology & anthropology
7
612 - Human physiology
7
200 - Religion
6
400 - Language
6
414 - Phonology & phonetics
5
331 - Labor economics
4
338 - Production
4
361 - Social problems & social welfare in general
4
332 - Financial economics
3
344 - Labor, social, education & cultural law
3
364 - Criminology
3
530 - Physics
3
550 - Earth sciences
3
590 - Animals (Zoology)
3
657 - Accounting
3
360 - Social problems & services; associations
2
410 - Linguistics
2
520 - Astronomy & allied sciences
2
more ...