Classification
514 - Topology
536
512 - Algebra
390
516 - Geometry
226
515 - Analysis
203
530 - Physics
97
700 - The arts; fine & decorative arts
80
620 - Engineering & allied operations
77
510 - Mathematics
72
600 - Technology
69
000 - Computer science, information & general works
67
333 - Economics of land & energy
52
511 - General principles of mathematics
49
900 - History & geography
48
519 - Probabilities & applied mathematics
37
500 - Natural sciences & mathematics
32
380 - Commerce, communications & transportation
28
610 - Medicine & health
24
363 - Other social problems & services
22
576 - Genetics & evolution
16
580 - Plants (Botany)
15
330 - Economics
13
140 - Specific philosophical schools
12
340 - Law
12
513 - Arithmetic
11
720 - Architecture
11
003 - Systems
10
540 - Chemistry & allied sciences
10
001 - Knowledge
8
414 - Phonology & phonetics
7
004 - Data processing & computer science
6
006 - Special computer methods
6
621 - Applied physics
6
320 - Political science
5
400 - Language
5
630 - Agriculture & related technologies
5
370 - Education
4
410 - Linguistics
4
518 - Numerical analysis
4
541 - Physical chemistry
4
501 - Philosophy & theory
3
551 - Geology, hydrology & meteorology
3
517 - [Unassigned]
2
612 - Human physiology
2
658 - General management
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
110 - Metaphysics
1
120 - Epistemology, causation & humankind
1
153 - Mental processes & intelligence
1
300 - Social sciences
1
more ...