Classification
500 - Natural sciences & mathematics
610 - Medicine & health
900 - History & geography
600 - Technology
4
620 - Engineering & allied operations
4
700 - The arts; fine & decorative arts
4
333 - Economics of land & energy
3
000 - Computer science, information & general works
2
140 - Specific philosophical schools
2
380 - Commerce, communications & transportation
2
330 - Economics
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
576 - Genetics & evolution
1