Classification
140 - Specific philosophical schools
3
320 - Political science
3
340 - Law
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
500 - Natural sciences & mathematics
3
576 - Genetics & evolution
3
600 - Technology
3
620 - Engineering & allied operations
3
700 - The arts; fine & decorative arts
720 - Architecture
3
900 - History & geography
3