Classification
333 - Economics of land & energy
363 - Other social problems & services
2
551 - Geology, hydrology & meteorology
2
600 - Technology
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
320 - Political science
1
330 - Economics
1
338 - Production
1
370 - Education
1
380 - Commerce, communications & transportation
1
530 - Physics
1
580 - Plants (Botany)
1
720 - Architecture
1