Classification
363 - Other social problems & services
576 - Genetics & evolution
600 - Technology
900 - History & geography
620 - Engineering & allied operations
27
700 - The arts; fine & decorative arts
20
380 - Commerce, communications & transportation
13
333 - Economics of land & energy
12
140 - Specific philosophical schools
9
580 - Plants (Botany)
7
610 - Medicine & health
7
720 - Architecture
7
340 - Law
6
000 - Computer science, information & general works
5
320 - Political science
5
330 - Economics
5
500 - Natural sciences & mathematics
5
414 - Phonology & phonetics
4
800 - Literature & rhetoric
4
300 - Social sciences
3
551 - Geology, hydrology & meteorology
3
170 - Ethics
2
304 - Factors affecting social behavior
2
370 - Education
2
400 - Language
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
658 - General management
2
100 - Philosophy & psychology
1
350 - Public administration & military science
1
410 - Linguistics
1
530 - Physics
1
650 - Management & auxiliary services
1