Classification
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
333 - Economics of land & energy
102
600 - Technology
61
000 - Computer science, information & general works
60
700 - The arts; fine & decorative arts
59
320 - Political science
53
900 - History & geography
39
140 - Specific philosophical schools
33
551 - Geology, hydrology & meteorology
31
610 - Medicine & health
31
620 - Engineering & allied operations
30
370 - Education
24
658 - General management
18
630 - Agriculture & related technologies
17
580 - Plants (Botany)
15
340 - Law
14
720 - Architecture
14
576 - Genetics & evolution
13
304 - Factors affecting social behavior
9
581 - Specific topics in natural history
9
800 - Literature & rhetoric
9
300 - Social sciences
6
336 - Public finance
6
400 - Language
6
414 - Phonology & phonetics
6
500 - Natural sciences & mathematics
6
657 - Accounting
6
410 - Linguistics
5
530 - Physics
5
200 - Religion
4
170 - Ethics
2
301 - Sociology & anthropology
2
361 - Social problems & social welfare in general
2
540 - Chemistry & allied sciences
2
100 - Philosophy & psychology
1
160 - Logic
1
297 - Islam, Babism & Bahai Faith
1
350 - Public administration & military science
1
550 - Earth sciences
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1
650 - Management & auxiliary services
1