Classification
410 - Linguistics
600 - Technology
610 - Medicine & health
620 - Engineering & allied operations
6
900 - History & geography
6
000 - Computer science, information & general works
4
700 - The arts; fine & decorative arts
4
333 - Economics of land & energy
3
400 - Language
3
140 - Specific philosophical schools
2
363 - Other social problems & services
2
370 - Education
2
380 - Commerce, communications & transportation
2
576 - Genetics & evolution
2
320 - Political science
1
330 - Economics
1
340 - Law
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
658 - General management
1