Classification
333 - Economics of land & energy
2
500 - Natural sciences & mathematics
581 - Specific topics in natural history
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
140 - Specific philosophical schools
1
300 - Social sciences
1
330 - Economics
1
363 - Other social problems & services
1
370 - Education
1
610 - Medicine & health
1
620 - Engineering & allied operations
1