Classification
900 - History & geography
600 - Technology
121
620 - Engineering & allied operations
118
700 - The arts; fine & decorative arts
98
333 - Economics of land & energy
65
000 - Computer science, information & general works
42
363 - Other social problems & services
37
380 - Commerce, communications & transportation
36
610 - Medicine & health
33
330 - Economics
28
140 - Specific philosophical schools
27
370 - Education
20
100 - Philosophy & psychology
19
576 - Genetics & evolution
19
580 - Plants (Botany)
16
800 - Literature & rhetoric
15
200 - Religion
13
300 - Social sciences
13
320 - Political science
13
340 - Law
13
540 - Chemistry & allied sciences
12
500 - Natural sciences & mathematics
11
551 - Geology, hydrology & meteorology
11
720 - Architecture
11
304 - Factors affecting social behavior
9
400 - Language
9
414 - Phonology & phonetics
9
530 - Physics
7
301 - Sociology & anthropology
5
410 - Linguistics
5
630 - Agriculture & related technologies
5
658 - General management
5
780 - Music
5
170 - Ethics
4
581 - Specific topics in natural history
4
770 - Photography, photographs & computer art
4
297 - Islam, Babism & Bahai Faith
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
612 - Human physiology
1
657 - Accounting
1
920 - Biography, genealogy & insignia
1