Classification
333 - Economics of land & energy
630 - Agriculture & related technologies
40
330 - Economics
26
600 - Technology
18
000 - Computer science, information & general works
16
363 - Other social problems & services
16
580 - Plants (Botany)
14
620 - Engineering & allied operations
14
700 - The arts; fine & decorative arts
12
581 - Specific topics in natural history
11
320 - Political science
9
551 - Geology, hydrology & meteorology
9
610 - Medicine & health
9
140 - Specific philosophical schools
8
900 - History & geography
8
658 - General management
6
380 - Commerce, communications & transportation
5
370 - Education
4
300 - Social sciences
3
301 - Sociology & anthropology
2
500 - Natural sciences & mathematics
2
540 - Chemistry & allied sciences
2
657 - Accounting
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
340 - Law
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
576 - Genetics & evolution
1
612 - Human physiology
1