Classification
330 - Economics
363 - Other social problems & services
333 - Economics of land & energy
50
600 - Technology
38
700 - The arts; fine & decorative arts
35
000 - Computer science, information & general works
33
320 - Political science
32
900 - History & geography
26
380 - Commerce, communications & transportation
25
620 - Engineering & allied operations
22
140 - Specific philosophical schools
21
551 - Geology, hydrology & meteorology
19
576 - Genetics & evolution
17
610 - Medicine & health
16
658 - General management
14
100 - Philosophy & psychology
12
370 - Education
12
500 - Natural sciences & mathematics
8
800 - Literature & rhetoric
8
581 - Specific topics in natural history
7
410 - Linguistics
6
720 - Architecture
6
304 - Factors affecting social behavior
5
200 - Religion
4
300 - Social sciences
4
580 - Plants (Botany)
3
170 - Ethics
2
297 - Islam, Babism & Bahai Faith
2
340 - Law
2
630 - Agriculture & related technologies
2
791 - Public performances
2
160 - Logic
1
301 - Sociology & anthropology
1
331 - Labor economics
1
364 - Criminology
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
615 - Pharmacology & therapeutics
1
657 - Accounting
1