Classification
304 - Factors affecting social behavior
363 - Other social problems & services
20
333 - Economics of land & energy
16
700 - The arts; fine & decorative arts
16
000 - Computer science, information & general works
12
380 - Commerce, communications & transportation
12
610 - Medicine & health
12
600 - Technology
11
620 - Engineering & allied operations
11
140 - Specific philosophical schools
10
576 - Genetics & evolution
10
330 - Economics
7
320 - Political science
6
900 - History & geography
6
580 - Plants (Botany)
5
340 - Law
4
414 - Phonology & phonetics
4
551 - Geology, hydrology & meteorology
4
500 - Natural sciences & mathematics
3
540 - Chemistry & allied sciences
3
200 - Religion
2
361 - Social problems & social welfare in general
2
370 - Education
2
530 - Physics
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
400 - Language
1
780 - Music
1
800 - Literature & rhetoric
1