Classification
333 - Economics of land & energy
700 - The arts; fine & decorative arts
37
600 - Technology
34
620 - Engineering & allied operations
30
900 - History & geography
26
000 - Computer science, information & general works
19
580 - Plants (Botany)
13
610 - Medicine & health
12
363 - Other social problems & services
9
330 - Economics
8
140 - Specific philosophical schools
7
380 - Commerce, communications & transportation
7
414 - Phonology & phonetics
6
630 - Agriculture & related technologies
5
500 - Natural sciences & mathematics
4
576 - Genetics & evolution
4
720 - Architecture
4
800 - Literature & rhetoric
4
340 - Law
3
530 - Physics
3
170 - Ethics
2
300 - Social sciences
2
320 - Political science
2
370 - Education
2
770 - Photography, photographs & computer art
2
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
550 - Earth sciences
1
581 - Specific topics in natural history
1
590 - Animals (Zoology)
1
621 - Applied physics
1
657 - Accounting
1
658 - General management
1