Classification
320 - Political science
333 - Economics of land & energy
3
363 - Other social problems & services
3
551 - Geology, hydrology & meteorology
330 - Economics
2
630 - Agriculture & related technologies
2
140 - Specific philosophical schools
1
297 - Islam, Babism & Bahai Faith
1
370 - Education
1
380 - Commerce, communications & transportation
1
520 - Astronomy & allied sciences
1
580 - Plants (Botany)
1
600 - Technology
1
610 - Medicine & health
1
700 - The arts; fine & decorative arts
1