Classification
630 - Agriculture & related technologies
363 - Other social problems & services
59
581 - Specific topics in natural history
58
333 - Economics of land & energy
43
330 - Economics
35
600 - Technology
30
000 - Computer science, information & general works
28
551 - Geology, hydrology & meteorology
28
580 - Plants (Botany)
27
700 - The arts; fine & decorative arts
27
620 - Engineering & allied operations
26
320 - Political science
24
610 - Medicine & health
18
140 - Specific philosophical schools
12
304 - Factors affecting social behavior
9
900 - History & geography
9
340 - Law
7
370 - Education
6
380 - Commerce, communications & transportation
6
500 - Natural sciences & mathematics
4
540 - Chemistry & allied sciences
4
576 - Genetics & evolution
4
200 - Religion
3
300 - Social sciences
3
361 - Social problems & social welfare in general
3
590 - Animals (Zoology)
3
800 - Literature & rhetoric
3
520 - Astronomy & allied sciences
2
657 - Accounting
2
658 - General management
2
664 - Food technology
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
350 - Public administration & military science
1
414 - Phonology & phonetics
1
530 - Physics
1
612 - Human physiology
1
720 - Architecture
1