Classification
330 - Economics
363 - Other social problems & services
333 - Economics of land & energy
485
320 - Political science
269
600 - Technology
267
700 - The arts; fine & decorative arts
250
000 - Computer science, information & general works
248
380 - Commerce, communications & transportation
161
610 - Medicine & health
161
551 - Geology, hydrology & meteorology
154
620 - Engineering & allied operations
151
900 - History & geography
132
140 - Specific philosophical schools
115
630 - Agriculture & related technologies
91
581 - Specific topics in natural history
82
500 - Natural sciences & mathematics
76
580 - Plants (Botany)
75
370 - Education
71
658 - General management
68
304 - Factors affecting social behavior
60
576 - Genetics & evolution
40
340 - Law
37
800 - Literature & rhetoric
28
720 - Architecture
27
100 - Philosophy & psychology
26
300 - Social sciences
24
540 - Chemistry & allied sciences
24
170 - Ethics
20
364 - Criminology
14
400 - Language
13
336 - Public finance
12
657 - Accounting
12
200 - Religion
10
410 - Linguistics
10
414 - Phonology & phonetics
10
530 - Physics
10
301 - Sociology & anthropology
9
361 - Social problems & social welfare in general
8
297 - Islam, Babism & Bahai Faith
7
612 - Human physiology
7
331 - Labor economics
6
350 - Public administration & military science
5
001 - Knowledge
4
520 - Astronomy & allied sciences
4
550 - Earth sciences
4
791 - Public performances
4
360 - Social problems & services; associations
3
615 - Pharmacology & therapeutics
3
332 - Financial economics
2
338 - Production
2
more ...