Classification
333 - Economics of land & energy
2
600 - Technology
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
900 - History & geography
2
340 - Law
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
610 - Medicine & health
1