Classification
551 - Geology, hydrology & meteorology
600 - Technology
700 - The arts; fine & decorative arts
333 - Economics of land & energy
20
620 - Engineering & allied operations
18
363 - Other social problems & services
17
900 - History & geography
13
330 - Economics
12
000 - Computer science, information & general works
11
610 - Medicine & health
11
320 - Political science
6
630 - Agriculture & related technologies
6
580 - Plants (Botany)
5
720 - Architecture
5
370 - Education
4
380 - Commerce, communications & transportation
4
800 - Literature & rhetoric
3
340 - Law
2
530 - Physics
2
540 - Chemistry & allied sciences
2
581 - Specific topics in natural history
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
360 - Social problems & services; associations
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
658 - General management
1