Classification
333 - Economics of land & energy
380 - Commerce, communications & transportation
30
500 - Natural sciences & mathematics
700 - The arts; fine & decorative arts
20
000 - Computer science, information & general works
19
620 - Engineering & allied operations
15
600 - Technology
13
576 - Genetics & evolution
11
610 - Medicine & health
10
900 - History & geography
10
330 - Economics
9
363 - Other social problems & services
9
140 - Specific philosophical schools
8
551 - Geology, hydrology & meteorology
6
340 - Law
5
414 - Phonology & phonetics
4
540 - Chemistry & allied sciences
4
580 - Plants (Botany)
4
300 - Social sciences
3
530 - Physics
3
581 - Specific topics in natural history
3
612 - Human physiology
3
658 - General management
3
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
304 - Factors affecting social behavior
1
320 - Political science
1
370 - Education
1
410 - Linguistics
1
630 - Agriculture & related technologies
1
720 - Architecture
1
800 - Literature & rhetoric
1