Classification
000 - Computer science, information & general works
1
100 - Philosophy & psychology
120 - Epistemology, causation & humankind
1
333 - Economics of land & energy
1
363 - Other social problems & services
380 - Commerce, communications & transportation
500 - Natural sciences & mathematics
1
600 - Technology
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1
720 - Architecture
1
800 - Literature & rhetoric
1
900 - History & geography