Classification
330 - Economics
24
333 - Economics of land & energy
21
363 - Other social problems & services
15
600 - Technology
14
700 - The arts; fine & decorative arts
13
620 - Engineering & allied operations
12
900 - History & geography
12
000 - Computer science, information & general works
11
320 - Political science
11
380 - Commerce, communications & transportation
10
551 - Geology, hydrology & meteorology
8
140 - Specific philosophical schools
7
610 - Medicine & health
5
581 - Specific topics in natural history
3
720 - Architecture
3
800 - Literature & rhetoric
3
580 - Plants (Botany)
2
300 - Social sciences
1
340 - Law
1
370 - Education
1
400 - Language
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
530 - Physics
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1
658 - General management
1