Classification
330 - Economics
600 - Technology
6
620 - Engineering & allied operations
6
700 - The arts; fine & decorative arts
900 - History & geography
140 - Specific philosophical schools
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
370 - Education
2
380 - Commerce, communications & transportation
2
580 - Plants (Botany)
2
000 - Computer science, information & general works
1
320 - Political science
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
610 - Medicine & health
1
658 - General management
1
720 - Architecture
1
800 - Literature & rhetoric
1