Classification
004 - Data processing & computer science
1,711
005 - Computer programming, programs & data
1,271
006 - Special computer methods
1,064
518 - Numerical analysis
658
600 - Technology
462
700 - The arts; fine & decorative arts
451
620 - Engineering & allied operations
392
000 - Computer science, information & general works
379
333 - Economics of land & energy
325
900 - History & geography
310
500 - Natural sciences & mathematics
192
380 - Commerce, communications & transportation
162
519 - Probabilities & applied mathematics
158
330 - Economics
143
610 - Medicine & health
142
363 - Other social problems & services
135
576 - Genetics & evolution
134
003 - Systems
119
621 - Applied physics
96
570 - Life sciences; biology
87
140 - Specific philosophical schools
86
580 - Plants (Botany)
83
658 - General management
80
511 - General principles of mathematics
76
510 - Mathematics
62
512 - Algebra
59
720 - Architecture
54
530 - Physics
49
025 - Library operations
43
340 - Law
38
630 - Agriculture & related technologies
38
551 - Geology, hydrology & meteorology
36
320 - Political science
34
400 - Language
34
515 - Analysis
31
370 - Education
25
516 - Geometry
24
800 - Literature & rhetoric
23
331 - Labor economics
22
540 - Chemistry & allied sciences
21
414 - Phonology & phonetics
20
300 - Social sciences
18
629 - Other branches of engineering
15
572 - Biochemistry
12
100 - Philosophy & psychology
11
384 - Communications; telecommunication
10
745 - Decorative arts
10
550 - Earth sciences
9
332 - Financial economics
8
410 - Linguistics
8
more ...