Classification
330 - Economics
500 - Natural sciences & mathematics
320 - Political science
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
140 - Specific philosophical schools
2
331 - Labor economics
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
160 - Logic
1
333 - Economics of land & energy
1
340 - Law
1
370 - Education
1
410 - Linguistics
1
530 - Physics
1
576 - Genetics & evolution
1
600 - Technology
1
610 - Medicine & health
1