Classification
330 - Economics
363 - Other social problems & services
333 - Economics of land & energy
68
600 - Technology
50
700 - The arts; fine & decorative arts
43
000 - Computer science, information & general works
33
380 - Commerce, communications & transportation
33
320 - Political science
27
610 - Medicine & health
23
620 - Engineering & allied operations
22
140 - Specific philosophical schools
21
370 - Education
17
900 - History & geography
17
551 - Geology, hydrology & meteorology
16
658 - General management
16
580 - Plants (Botany)
15
630 - Agriculture & related technologies
9
576 - Genetics & evolution
8
581 - Specific topics in natural history
8
800 - Literature & rhetoric
7
170 - Ethics
6
340 - Law
6
720 - Architecture
6
100 - Philosophy & psychology
5
300 - Social sciences
5
400 - Language
5
500 - Natural sciences & mathematics
5
410 - Linguistics
4
657 - Accounting
4
791 - Public performances
4
520 - Astronomy & allied sciences
3
297 - Islam, Babism & Bahai Faith
2
304 - Factors affecting social behavior
2
350 - Public administration & military science
2
361 - Social problems & social welfare in general
2
414 - Phonology & phonetics
2
612 - Human physiology
2
160 - Logic
1
200 - Religion
1
360 - Social problems & services; associations
1
530 - Physics
1
615 - Pharmacology & therapeutics
1
650 - Management & auxiliary services
1
780 - Music
1