Classification
900 - History & geography
600 - Technology
120
620 - Engineering & allied operations
118
700 - The arts; fine & decorative arts
92
333 - Economics of land & energy
64
000 - Computer science, information & general works
41
363 - Other social problems & services
37
380 - Commerce, communications & transportation
34
610 - Medicine & health
32
330 - Economics
27
140 - Specific philosophical schools
25
370 - Education
20
100 - Philosophy & psychology
18
576 - Genetics & evolution
18
580 - Plants (Botany)
16
800 - Literature & rhetoric
14
340 - Law
12
540 - Chemistry & allied sciences
12
500 - Natural sciences & mathematics
11
551 - Geology, hydrology & meteorology
11
720 - Architecture
11
200 - Religion
10
320 - Political science
10
300 - Social sciences
9
400 - Language
9
414 - Phonology & phonetics
9
304 - Factors affecting social behavior
8
530 - Physics
7
630 - Agriculture & related technologies
5
658 - General management
5
780 - Music
5
170 - Ethics
4
301 - Sociology & anthropology
4
770 - Photography, photographs & computer art
4
297 - Islam, Babism & Bahai Faith
3
410 - Linguistics
3
791 - Public performances
3
361 - Social problems & social welfare in general
2
120 - Epistemology, causation & humankind
1
398 - Folklore
1
520 - Astronomy & allied sciences
1
581 - Specific topics in natural history
1
612 - Human physiology
1
657 - Accounting
1
920 - Biography, genealogy & insignia
1