Classification
333 - Economics of land & energy
576 - Genetics & evolution
620 - Engineering & allied operations
600 - Technology
39
900 - History & geography
38
700 - The arts; fine & decorative arts
35
000 - Computer science, information & general works
14
380 - Commerce, communications & transportation
12
363 - Other social problems & services
10
580 - Plants (Botany)
9
330 - Economics
8
500 - Natural sciences & mathematics
7
720 - Architecture
7
140 - Specific philosophical schools
4
340 - Law
4
414 - Phonology & phonetics
3
610 - Medicine & health
3
800 - Literature & rhetoric
3
170 - Ethics
2
300 - Social sciences
2
370 - Education
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
630 - Agriculture & related technologies
2
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
320 - Political science
1
361 - Social problems & social welfare in general
1
650 - Management & auxiliary services
1
657 - Accounting
1
770 - Photography, photographs & computer art
1