Classification
333 - Economics of land & energy
900 - History & geography
600 - Technology
683
620 - Engineering & allied operations
656
700 - The arts; fine & decorative arts
481
330 - Economics
232
363 - Other social problems & services
231
000 - Computer science, information & general works
191
380 - Commerce, communications & transportation
177
610 - Medicine & health
128
320 - Political science
111
580 - Plants (Botany)
105
370 - Education
92
576 - Genetics & evolution
77
140 - Specific philosophical schools
73
551 - Geology, hydrology & meteorology
61
720 - Architecture
57
500 - Natural sciences & mathematics
56
300 - Social sciences
46
340 - Law
45
800 - Literature & rhetoric
45
100 - Philosophy & psychology
36
414 - Phonology & phonetics
35
630 - Agriculture & related technologies
34
540 - Chemistry & allied sciences
29
581 - Specific topics in natural history
27
530 - Physics
26
400 - Language
19
658 - General management
18
170 - Ethics
15
301 - Sociology & anthropology
15
304 - Factors affecting social behavior
14
200 - Religion
11
780 - Music
11
410 - Linguistics
8
120 - Epistemology, causation & humankind
7
361 - Social problems & social welfare in general
6
770 - Photography, photographs & computer art
6
657 - Accounting
5
297 - Islam, Babism & Bahai Faith
4
612 - Human physiology
4
350 - Public administration & military science
3
550 - Earth sciences
3
296 - Judaism
2
336 - Public finance
2
360 - Social problems & services; associations
2
615 - Pharmacology & therapeutics
2
650 - Management & auxiliary services
2
160 - Logic
1
364 - Criminology
1
more ...