Classification
380 - Commerce, communications & transportation
576 - Genetics & evolution
600 - Technology
900 - History & geography
620 - Engineering & allied operations
28
700 - The arts; fine & decorative arts
25
333 - Economics of land & energy
17
363 - Other social problems & services
12
000 - Computer science, information & general works
10
140 - Specific philosophical schools
10
720 - Architecture
9
330 - Economics
6
340 - Law
6
500 - Natural sciences & mathematics
6
610 - Medicine & health
6
320 - Political science
4
800 - Literature & rhetoric
4
304 - Factors affecting social behavior
3
630 - Agriculture & related technologies
3
170 - Ethics
2
300 - Social sciences
2
580 - Plants (Botany)
2
650 - Management & auxiliary services
2
658 - General management
2
200 - Religion
1
370 - Education
1
400 - Language
1
410 - Linguistics
1
414 - Phonology & phonetics
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
770 - Photography, photographs & computer art
1