Classification
380 - Commerce, communications & transportation
576 - Genetics & evolution
600 - Technology
620 - Engineering & allied operations
900 - History & geography
700 - The arts; fine & decorative arts
23
333 - Economics of land & energy
16
363 - Other social problems & services
11
000 - Computer science, information & general works
9
140 - Specific philosophical schools
9
720 - Architecture
9
340 - Law
6
500 - Natural sciences & mathematics
6
610 - Medicine & health
6
330 - Economics
5
800 - Literature & rhetoric
4
320 - Political science
3
170 - Ethics
2
300 - Social sciences
2
304 - Factors affecting social behavior
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
658 - General management
2
370 - Education
1
400 - Language
1
410 - Linguistics
1
414 - Phonology & phonetics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
650 - Management & auxiliary services
1
770 - Photography, photographs & computer art
1