Classification
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400 - Language
2
407 - Education, research & related topics
1
410 - Linguistics
5
418 - Standard usage & applied linguistics
1
500 - Natural sciences & mathematics
2
518 - Numerical analysis
1
530 - Physics
1
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
3
581 - Specific topics in natural history
4
600 - Technology
12
610 - Medicine & health
7
620 - Engineering & allied operations
3
621 - Applied physics
1
658 - General management
2
700 - The arts; fine & decorative arts
8
720 - Architecture
2
800 - Literature & rhetoric
4
900 - History & geography
20
909 - World history
1
973 - United States
1