Classification
900 - History & geography
600 - Technology
54
620 - Engineering & allied operations
49
330 - Economics
43
333 - Economics of land & energy
42
700 - The arts; fine & decorative arts
34
320 - Political science
27
363 - Other social problems & services
20
380 - Commerce, communications & transportation
20
580 - Plants (Botany)
20
000 - Computer science, information & general works
16
610 - Medicine & health
16
140 - Specific philosophical schools
13
576 - Genetics & evolution
13
340 - Law
8
300 - Social sciences
6
551 - Geology, hydrology & meteorology
6
630 - Agriculture & related technologies
6
658 - General management
6
370 - Education
4
657 - Accounting
4
304 - Factors affecting social behavior
3
400 - Language
3
500 - Natural sciences & mathematics
3
720 - Architecture
3
800 - Literature & rhetoric
3
170 - Ethics
2
410 - Linguistics
2
530 - Physics
2
540 - Chemistry & allied sciences
2
581 - Specific topics in natural history
2
612 - Human physiology
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
350 - Public administration & military science
1
414 - Phonology & phonetics
1