Classification
620 - Engineering & allied operations
600 - Technology
79
900 - History & geography
73
700 - The arts; fine & decorative arts
51
333 - Economics of land & energy
42
380 - Commerce, communications & transportation
22
000 - Computer science, information & general works
20
363 - Other social problems & services
14
500 - Natural sciences & mathematics
8
580 - Plants (Botany)
8
610 - Medicine & health
8
140 - Specific philosophical schools
7
414 - Phonology & phonetics
7
576 - Genetics & evolution
6
320 - Political science
5
330 - Economics
5
530 - Physics
5
540 - Chemistry & allied sciences
5
551 - Geology, hydrology & meteorology
5
581 - Specific topics in natural history
5
300 - Social sciences
4
340 - Law
3
370 - Education
3
612 - Human physiology
3
800 - Literature & rhetoric
3
550 - Earth sciences
2
630 - Agriculture & related technologies
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
170 - Ethics
1
304 - Factors affecting social behavior
1
400 - Language
1
621 - Applied physics
1
657 - Accounting
1
720 - Architecture
1