Classification
363 - Other social problems & services
551 - Geology, hydrology & meteorology
333 - Economics of land & energy
12
330 - Economics
11
630 - Agriculture & related technologies
9
000 - Computer science, information & general works
8
320 - Political science
6
580 - Plants (Botany)
6
600 - Technology
5
610 - Medicine & health
5
700 - The arts; fine & decorative arts
5
620 - Engineering & allied operations
4
140 - Specific philosophical schools
3
380 - Commerce, communications & transportation
3
658 - General management
3
304 - Factors affecting social behavior
2
370 - Education
2
414 - Phonology & phonetics
2
581 - Specific topics in natural history
2
720 - Architecture
2
900 - History & geography
2
100 - Philosophy & psychology
1
170 - Ethics
1
340 - Law
1
520 - Astronomy & allied sciences
1
540 - Chemistry & allied sciences
1
615 - Pharmacology & therapeutics
1