Classification
330 - Economics
500 - Natural sciences & mathematics
000 - Computer science, information & general works
2
363 - Other social problems & services
2
576 - Genetics & evolution
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
300 - Social sciences
1
302 - Social interaction
1
333 - Economics of land & energy
1
380 - Commerce, communications & transportation
1
381 - Commerce
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
630 - Agriculture & related technologies
1
658 - General management
1
670 - Manufacturing
1
900 - History & geography
1