Classification
414 - Phonology & phonetics
000 - Computer science, information & general works
29
700 - The arts; fine & decorative arts
24
581 - Specific topics in natural history
23
363 - Other social problems & services
18
551 - Geology, hydrology & meteorology
18
580 - Plants (Botany)
18
900 - History & geography
13
333 - Economics of land & energy
12
576 - Genetics & evolution
12
380 - Commerce, communications & transportation
11
620 - Engineering & allied operations
10
540 - Chemistry & allied sciences
9
330 - Economics
8
610 - Medicine & health
8
140 - Specific philosophical schools
7
320 - Political science
7
600 - Technology
7
500 - Natural sciences & mathematics
6
612 - Human physiology
6
300 - Social sciences
3
304 - Factors affecting social behavior
3
340 - Law
2
370 - Education
2
590 - Animals (Zoology)
2
630 - Agriculture & related technologies
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
170 - Ethics
1
400 - Language
1
720 - Architecture
1