Classification
000 - Computer science, information & general works
41
610 - Medicine & health
36
600 - Technology
28
580 - Plants (Botany)
24
700 - The arts; fine & decorative arts
24
333 - Economics of land & energy
19
363 - Other social problems & services
17
576 - Genetics & evolution
17
620 - Engineering & allied operations
17
570 - Life sciences; biology
16
140 - Specific philosophical schools
15
900 - History & geography
12
615 - Pharmacology & therapeutics
11
380 - Commerce, communications & transportation
10
581 - Specific topics in natural history
9
630 - Agriculture & related technologies
8
540 - Chemistry & allied sciences
7
551 - Geology, hydrology & meteorology
5
414 - Phonology & phonetics
4
500 - Natural sciences & mathematics
4
530 - Physics
4
720 - Architecture
4
612 - Human physiology
3
304 - Factors affecting social behavior
2
320 - Political science
2
330 - Economics
2
340 - Law
1
370 - Education
1
628 - Sanitary & municipal engineering
1
660 - Chemical engineering
1
800 - Literature & rhetoric
1