Classification
300 - Social sciences
330 - Economics
363 - Other social problems & services
500 - Natural sciences & mathematics
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
301 - Sociology & anthropology
1
333 - Economics of land & energy
1
340 - Law
1
370 - Education
1
400 - Language
1
600 - Technology
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1