Classification
370 - Education
333 - Economics of land & energy
22
500 - Natural sciences & mathematics
21
600 - Technology
15
700 - The arts; fine & decorative arts
15
620 - Engineering & allied operations
14
400 - Language
11
900 - History & geography
11
100 - Philosophy & psychology
10
000 - Computer science, information & general works
9
140 - Specific philosophical schools
9
300 - Social sciences
9
320 - Political science
9
363 - Other social problems & services
9
380 - Commerce, communications & transportation
6
540 - Chemistry & allied sciences
5
610 - Medicine & health
4
330 - Economics
3
800 - Literature & rhetoric
3
120 - Epistemology, causation & humankind
2
200 - Religion
2
507 - Education, research & related topics
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
581 - Specific topics in natural history
2
658 - General management
2
720 - Architecture
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
340 - Law
1
410 - Linguistics
1
519 - Probabilities & applied mathematics
1
520 - Astronomy & allied sciences
1
780 - Music
1