Classification
370 - Education
900 - History & geography
300 - Social sciences
3
610 - Medicine & health
3
333 - Economics of land & energy
2
363 - Other social problems & services
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
100 - Philosophy & psychology
1
200 - Religion
1
330 - Economics
1
340 - Law
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1