Classification
320 - Political science
363 - Other social problems & services
576 - Genetics & evolution
600 - Technology
900 - History & geography
620 - Engineering & allied operations
4
700 - The arts; fine & decorative arts
4
140 - Specific philosophical schools
3
340 - Law
3
380 - Commerce, communications & transportation
3
500 - Natural sciences & mathematics
3
720 - Architecture
3
100 - Philosophy & psychology
1
300 - Social sciences
1
330 - Economics
1
333 - Economics of land & energy
1
350 - Public administration & military science
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
610 - Medicine & health
1