Classification
900 - History & geography
320 - Political science
49
700 - The arts; fine & decorative arts
42
600 - Technology
40
330 - Economics
38
333 - Economics of land & energy
37
610 - Medicine & health
32
620 - Engineering & allied operations
30
100 - Philosophy & psychology
24
370 - Education
22
140 - Specific philosophical schools
21
576 - Genetics & evolution
20
000 - Computer science, information & general works
18
380 - Commerce, communications & transportation
16
363 - Other social problems & services
15
800 - Literature & rhetoric
15
300 - Social sciences
14
400 - Language
14
200 - Religion
11
301 - Sociology & anthropology
11
720 - Architecture
10
340 - Law
9
410 - Linguistics
9
304 - Factors affecting social behavior
4
500 - Natural sciences & mathematics
4
551 - Geology, hydrology & meteorology
4
780 - Music
4
170 - Ethics
3
580 - Plants (Botany)
3
581 - Specific topics in natural history
3
658 - General management
3
361 - Social problems & social welfare in general
2
364 - Criminology
2
414 - Phonology & phonetics
2
530 - Physics
2
612 - Human physiology
2
880 - Hellenic literatures; classical Greek
2
231 - God
1
232 - Jesus Christ & his family
1
297 - Islam, Babism & Bahai Faith
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
398 - Folklore
1
540 - Chemistry & allied sciences
1
630 - Agriculture & related technologies
1
770 - Photography, photographs & computer art
1
791 - Public performances
1
839 - Other Germanic literatures
1
940 - History of Europe
1