Classification
100 - Philosophy & psychology
333 - Economics of land & energy
17
900 - History & geography
17
000 - Computer science, information & general works
14
363 - Other social problems & services
13
700 - The arts; fine & decorative arts
13
140 - Specific philosophical schools
12
170 - Ethics
12
300 - Social sciences
12
610 - Medicine & health
12
500 - Natural sciences & mathematics
10
576 - Genetics & evolution
9
320 - Political science
8
581 - Specific topics in natural history
8
600 - Technology
8
301 - Sociology & anthropology
7
370 - Education
7
330 - Economics
6
620 - Engineering & allied operations
6
120 - Epistemology, causation & humankind
5
200 - Religion
5
380 - Commerce, communications & transportation
5
400 - Language
5
580 - Plants (Botany)
5
530 - Physics
4
800 - Literature & rhetoric
3
410 - Linguistics
2
414 - Phonology & phonetics
2
540 - Chemistry & allied sciences
2
551 - Geology, hydrology & meteorology
2
630 - Agriculture & related technologies
2
658 - General management
2
780 - Music
2
160 - Logic
1
304 - Factors affecting social behavior
1
340 - Law
1
350 - Public administration & military science
1
590 - Animals (Zoology)
1
720 - Architecture
1
770 - Photography, photographs & computer art
1
791 - Public performances
1
920 - Biography, genealogy & insignia
1