Classification
576 - Genetics & evolution
551 - Geology, hydrology & meteorology
7
000 - Computer science, information & general works
6
333 - Economics of land & energy
6
363 - Other social problems & services
5
600 - Technology
4
620 - Engineering & allied operations
4
700 - The arts; fine & decorative arts
4
900 - History & geography
4
330 - Economics
3
610 - Medicine & health
2
140 - Specific philosophical schools
1
320 - Political science
1
380 - Commerce, communications & transportation
1
410 - Linguistics
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
630 - Agriculture & related technologies
1