Classification
300 - Social sciences
333 - Economics of land & energy
2
370 - Education
2
400 - Language
500 - Natural sciences & mathematics
2
600 - Technology
2
620 - Engineering & allied operations
140 - Specific philosophical schools
1
320 - Political science
1
330 - Economics
1
340 - Law
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
540 - Chemistry & allied sciences
1
610 - Medicine & health
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1