Classification
551 - Geology, hydrology & meteorology
580 - Plants (Botany)
18
000 - Computer science, information & general works
13
700 - The arts; fine & decorative arts
13
363 - Other social problems & services
9
581 - Specific topics in natural history
9
610 - Medicine & health
9
333 - Economics of land & energy
8
330 - Economics
5
380 - Commerce, communications & transportation
5
414 - Phonology & phonetics
5
576 - Genetics & evolution
5
600 - Technology
5
620 - Engineering & allied operations
5
630 - Agriculture & related technologies
5
140 - Specific philosophical schools
4
300 - Social sciences
3
500 - Natural sciences & mathematics
3
540 - Chemistry & allied sciences
3
612 - Human physiology
3
520 - Astronomy & allied sciences
2
304 - Factors affecting social behavior
1
320 - Political science
1
370 - Education
1
410 - Linguistics
1
658 - General management
1
720 - Architecture
1
900 - History & geography
1