Classification
700 - The arts; fine & decorative arts
13
900 - History & geography
13
000 - Computer science, information & general works
10
380 - Commerce, communications & transportation
10
600 - Technology
9
363 - Other social problems & services
8
551 - Geology, hydrology & meteorology
8
576 - Genetics & evolution
7
620 - Engineering & allied operations
7
414 - Phonology & phonetics
6
304 - Factors affecting social behavior
5
330 - Economics
5
333 - Economics of land & energy
5
500 - Natural sciences & mathematics
4
320 - Political science
3
800 - Literature & rhetoric
3
140 - Specific philosophical schools
2
550 - Earth sciences
2
301 - Sociology & anthropology
1
340 - Law
1
530 - Physics
1
540 - Chemistry & allied sciences
1
577 - Ecology
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
658 - General management
1
720 - Architecture
1