Classification
380 - Commerce, communications & transportation
576 - Genetics & evolution
600 - Technology
17
333 - Economics of land & energy
15
700 - The arts; fine & decorative arts
15
000 - Computer science, information & general works
13
620 - Engineering & allied operations
12
363 - Other social problems & services
11
900 - History & geography
11
140 - Specific philosophical schools
10
330 - Economics
8
500 - Natural sciences & mathematics
8
340 - Law
7
320 - Political science
6
610 - Medicine & health
6
720 - Architecture
6
630 - Agriculture & related technologies
3
170 - Ethics
2
300 - Social sciences
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
657 - Accounting
2
658 - General management
2
800 - Literature & rhetoric
2
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
370 - Education
1
410 - Linguistics
1
530 - Physics
1