Classification
330 - Economics
1,063
333 - Economics of land & energy
790
700 - The arts; fine & decorative arts
737
600 - Technology
716
000 - Computer science, information & general works
623
363 - Other social problems & services
614
620 - Engineering & allied operations
500
900 - History & geography
481
320 - Political science
433
610 - Medicine & health
425
380 - Commerce, communications & transportation
364
140 - Specific philosophical schools
263
370 - Education
261
551 - Geology, hydrology & meteorology
242
580 - Plants (Botany)
217
658 - General management
193
630 - Agriculture & related technologies
163
300 - Social sciences
161
500 - Natural sciences & mathematics
127
340 - Law
124
581 - Specific topics in natural history
124
576 - Genetics & evolution
122
100 - Philosophy & psychology
111
720 - Architecture
97
800 - Literature & rhetoric
69
540 - Chemistry & allied sciences
66
170 - Ethics
58
400 - Language
58
657 - Accounting
54
304 - Factors affecting social behavior
47
530 - Physics
44
301 - Sociology & anthropology
43
361 - Social problems & social welfare in general
41
414 - Phonology & phonetics
35
410 - Linguistics
33
350 - Public administration & military science
29
200 - Religion
26
612 - Human physiology
25
780 - Music
16
297 - Islam, Babism & Bahai Faith
14
336 - Public finance
13
650 - Management & auxiliary services
13
615 - Pharmacology & therapeutics
11
160 - Logic
7
360 - Social problems & services; associations
7
550 - Earth sciences
7
120 - Epistemology, causation & humankind
6
520 - Astronomy & allied sciences
6
791 - Public performances
5
364 - Criminology
4
more ...