Classification
380 - Commerce, communications & transportation
19
333 - Economics of land & energy
15
600 - Technology
11
700 - The arts; fine & decorative arts
11
620 - Engineering & allied operations
9
330 - Economics
8
900 - History & geography
8
000 - Computer science, information & general works
7
363 - Other social problems & services
7
320 - Political science
5
140 - Specific philosophical schools
4
658 - General management
4
340 - Law
3
551 - Geology, hydrology & meteorology
3
580 - Plants (Botany)
3
500 - Natural sciences & mathematics
2
576 - Genetics & evolution
2
610 - Medicine & health
2
300 - Social sciences
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
370 - Education
1
388 - Transportation; ground transportation
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
581 - Specific topics in natural history
1
657 - Accounting
1
720 - Architecture
1
800 - Literature & rhetoric
1