Classification
100 - Philosophy & psychology
610 - Medicine & health
2
300 - Social sciences
1
301 - Sociology & anthropology
1
330 - Economics
1
333 - Economics of land & energy
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
600 - Technology
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1