Classification
000 - Computer science, information & general works
9
700 - The arts; fine & decorative arts
7
333 - Economics of land & energy
6
363 - Other social problems & services
6
610 - Medicine & health
6
600 - Technology
5
140 - Specific philosophical schools
4
540 - Chemistry & allied sciences
4
330 - Economics
3
380 - Commerce, communications & transportation
3
580 - Plants (Botany)
3
620 - Engineering & allied operations
3
900 - History & geography
3
414 - Phonology & phonetics
2
576 - Genetics & evolution
2
320 - Political science
1
340 - Law
1
361 - Social problems & social welfare in general
1
547 - Organic chemistry
1
628 - Sanitary & municipal engineering
1
660 - Chemical engineering
1
661 - Industrial chemicals
1
665 - Industrial oils, fats, waxes & gases
1
800 - Literature & rhetoric
1