Classification
000 - Computer science, information & general works
700 - The arts; fine & decorative arts
333 - Economics of land & energy
80
600 - Technology
65
620 - Engineering & allied operations
43
330 - Economics
41
576 - Genetics & evolution
40
500 - Natural sciences & mathematics
36
610 - Medicine & health
35
580 - Plants (Botany)
34
900 - History & geography
31
363 - Other social problems & services
30
380 - Commerce, communications & transportation
30
540 - Chemistry & allied sciences
27
140 - Specific philosophical schools
19
530 - Physics
19
414 - Phonology & phonetics
17
551 - Geology, hydrology & meteorology
16
340 - Law
13
720 - Architecture
12
630 - Agriculture & related technologies
10
612 - Human physiology
9
800 - Literature & rhetoric
9
320 - Political science
8
581 - Specific topics in natural history
7
304 - Factors affecting social behavior
6
658 - General management
6
400 - Language
4
300 - Social sciences
3
410 - Linguistics
2
160 - Logic
1
170 - Ethics
1
361 - Social problems & social welfare in general
1
370 - Education
1
550 - Earth sciences
1