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