Classification
330 - Economics
380 - Commerce, communications & transportation
900 - History & geography
333 - Economics of land & energy
29
600 - Technology
27
620 - Engineering & allied operations
23
700 - The arts; fine & decorative arts
21
000 - Computer science, information & general works
14
363 - Other social problems & services
14
551 - Geology, hydrology & meteorology
8
580 - Plants (Botany)
7
320 - Political science
6
370 - Education
6
610 - Medicine & health
6
720 - Architecture
6
340 - Law
5
140 - Specific philosophical schools
3
630 - Agriculture & related technologies
3
658 - General management
3
500 - Natural sciences & mathematics
2
200 - Religion
1
304 - Factors affecting social behavior
1
400 - Language
1
410 - Linguistics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
576 - Genetics & evolution
1
800 - Literature & rhetoric
1