Classification
581 - Specific topics in natural history
363 - Other social problems & services
10
333 - Economics of land & energy
9
380 - Commerce, communications & transportation
7
551 - Geology, hydrology & meteorology
7
580 - Plants (Botany)
7
000 - Computer science, information & general works
6
330 - Economics
6
576 - Genetics & evolution
6
610 - Medicine & health
6
700 - The arts; fine & decorative arts
6
140 - Specific philosophical schools
5
500 - Natural sciences & mathematics
4
600 - Technology
4
612 - Human physiology
4
620 - Engineering & allied operations
4
630 - Agriculture & related technologies
4
300 - Social sciences
3
414 - Phonology & phonetics
3
540 - Chemistry & allied sciences
3
304 - Factors affecting social behavior
2
340 - Law
2
370 - Education
2
350 - Public administration & military science
1
400 - Language
1
520 - Astronomy & allied sciences
1
900 - History & geography
1