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