Classification
600 - Technology
51
700 - The arts; fine & decorative arts
42
620 - Engineering & allied operations
36
333 - Economics of land & energy
32
363 - Other social problems & services
28
900 - History & geography
27
000 - Computer science, information & general works
18
330 - Economics
16
580 - Plants (Botany)
15
540 - Chemistry & allied sciences
10
610 - Medicine & health
8
380 - Commerce, communications & transportation
7
140 - Specific philosophical schools
5
500 - Natural sciences & mathematics
4
630 - Agriculture & related technologies
4
530 - Physics
3
551 - Geology, hydrology & meteorology
3
304 - Factors affecting social behavior
2
320 - Political science
2
370 - Education
2
414 - Phonology & phonetics
2
576 - Genetics & evolution
2
340 - Law
1
361 - Social problems & social welfare in general
1