Classification
330 - Economics
363 - Other social problems & services
600 - Technology
333 - Economics of land & energy
194
620 - Engineering & allied operations
158
700 - The arts; fine & decorative arts
115
900 - History & geography
92
320 - Political science
82
000 - Computer science, information & general works
79
380 - Commerce, communications & transportation
66
610 - Medicine & health
62
630 - Agriculture & related technologies
56
551 - Geology, hydrology & meteorology
53
370 - Education
44
140 - Specific philosophical schools
43
580 - Plants (Botany)
41
581 - Specific topics in natural history
34
658 - General management
28
300 - Social sciences
20
576 - Genetics & evolution
19
304 - Factors affecting social behavior
18
540 - Chemistry & allied sciences
15
720 - Architecture
14
800 - Literature & rhetoric
14
340 - Law
12
500 - Natural sciences & mathematics
9
400 - Language
8
657 - Accounting
7
200 - Religion
6
100 - Philosophy & psychology
5
350 - Public administration & military science
5
170 - Ethics
4
301 - Sociology & anthropology
4
414 - Phonology & phonetics
4
297 - Islam, Babism & Bahai Faith
3
410 - Linguistics
3
530 - Physics
3
160 - Logic
2
360 - Social problems & services; associations
2
361 - Social problems & social welfare in general
2
615 - Pharmacology & therapeutics
2
336 - Public finance
1
520 - Astronomy & allied sciences
1
550 - Earth sciences
1
612 - Human physiology
1
650 - Management & auxiliary services
1