Classification
516 - Geometry
1,570
512 - Algebra
418
510 - Mathematics
331
515 - Analysis
331
530 - Physics
173
514 - Topology
166
519 - Probabilities & applied mathematics
104
511 - General principles of mathematics
76
620 - Engineering & allied operations
74
006 - Special computer methods
62
700 - The arts; fine & decorative arts
62
004 - Data processing & computer science
55
600 - Technology
55
000 - Computer science, information & general works
54
500 - Natural sciences & mathematics
43
900 - History & geography
38
333 - Economics of land & energy
35
330 - Economics
33
003 - Systems
30
320 - Political science
27
621 - Applied physics
25
380 - Commerce, communications & transportation
18
363 - Other social problems & services
17
580 - Plants (Botany)
14
720 - Architecture
14
005 - Computer programming, programs & data
12
518 - Numerical analysis
12
531 - Classical mechanics; solid mechanics
12
540 - Chemistry & allied sciences
12
576 - Genetics & evolution
12
001 - Knowledge
11
513 - Arithmetic
11
610 - Medicine & health
11
629 - Other branches of engineering
11
370 - Education
10
414 - Phonology & phonetics
10
140 - Specific philosophical schools
8
340 - Law
7
501 - Philosophy & theory
7
520 - Astronomy & allied sciences
7
551 - Geology, hydrology & meteorology
7
581 - Specific topics in natural history
6
800 - Literature & rhetoric
5
100 - Philosophy & psychology
4
350 - Public administration & military science
4
570 - Life sciences; biology
4
770 - Photography, photographs & computer art
4
300 - Social sciences
3
400 - Language
3
509 - Historical, geographic & persons treatment
3
more ...