Classification
519 - Probabilities & applied mathematics
2,366
510 - Mathematics
376
515 - Analysis
234
004 - Data processing & computer science
215
006 - Special computer methods
185
330 - Economics
162
530 - Physics
127
003 - Systems
114
500 - Natural sciences & mathematics
113
000 - Computer science, information & general works
112
620 - Engineering & allied operations
108
005 - Computer programming, programs & data
104
700 - The arts; fine & decorative arts
87
621 - Applied physics
82
658 - General management
81
600 - Technology
70
333 - Economics of land & energy
66
511 - General principles of mathematics
64
518 - Numerical analysis
60
900 - History & geography
52
570 - Life sciences; biology
48
380 - Commerce, communications & transportation
41
320 - Political science
40
512 - Algebra
40
300 - Social sciences
34
610 - Medicine & health
34
363 - Other social problems & services
32
576 - Genetics & evolution
32
332 - Financial economics
31
551 - Geology, hydrology & meteorology
31
340 - Law
28
629 - Other branches of engineering
23
140 - Specific philosophical schools
18
516 - Geometry
18
580 - Plants (Botany)
18
368 - Insurance
14
025 - Library operations
12
572 - Biochemistry
12
745 - Decorative arts
12
800 - Literature & rhetoric
11
100 - Philosophy & psychology
10
301 - Sociology & anthropology
10
540 - Chemistry & allied sciences
10
550 - Earth sciences
10
001 - Knowledge
9
304 - Factors affecting social behavior
9
370 - Education
9
414 - Phonology & phonetics
9
501 - Philosophy & theory
9
331 - Labor economics
8
more ...