Classification
620 - Engineering & allied operations
600 - Technology
25
900 - History & geography
16
700 - The arts; fine & decorative arts
13
333 - Economics of land & energy
9
363 - Other social problems & services
8
000 - Computer science, information & general works
7
630 - Agriculture & related technologies
7
330 - Economics
6
551 - Geology, hydrology & meteorology
6
610 - Medicine & health
6
380 - Commerce, communications & transportation
5
580 - Plants (Botany)
5
140 - Specific philosophical schools
3
540 - Chemistry & allied sciences
3
581 - Specific topics in natural history
3
720 - Architecture
3
332 - Financial economics
2
338 - Production
2
658 - General management
2
304 - Factors affecting social behavior
1
320 - Political science
1
336 - Public finance
1
370 - Education
1
381 - Commerce
1
384 - Communications; telecommunication
1
400 - Language
1
410 - Linguistics
1
414 - Phonology & phonetics
1
576 - Genetics & evolution
1
612 - Human physiology
1