Classification
330 - Economics
363 - Other social problems & services
27
333 - Economics of land & energy
25
600 - Technology
24
700 - The arts; fine & decorative arts
20
620 - Engineering & allied operations
19
000 - Computer science, information & general works
15
580 - Plants (Botany)
12
900 - History & geography
12
610 - Medicine & health
9
140 - Specific philosophical schools
7
320 - Political science
7
800 - Literature & rhetoric
7
581 - Specific topics in natural history
6
380 - Commerce, communications & transportation
5
630 - Agriculture & related technologies
5
658 - General management
5
370 - Education
4
551 - Geology, hydrology & meteorology
4
540 - Chemistry & allied sciences
3
361 - Social problems & social welfare in general
2
576 - Genetics & evolution
2
612 - Human physiology
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
331 - Labor economics
1
410 - Linguistics
1
657 - Accounting
1