Classification
551 - Geology, hydrology & meteorology
600 - Technology
610 - Medicine & health
333 - Economics of land & energy
14
363 - Other social problems & services
13
330 - Economics
12
700 - The arts; fine & decorative arts
11
620 - Engineering & allied operations
10
000 - Computer science, information & general works
8
900 - History & geography
7
320 - Political science
5
370 - Education
5
630 - Agriculture & related technologies
5
720 - Architecture
4
380 - Commerce, communications & transportation
3
658 - General management
3
360 - Social problems & services; associations
2
500 - Natural sciences & mathematics
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
170 - Ethics
1
340 - Law
1
410 - Linguistics
1
800 - Literature & rhetoric
1