Classification
006 - Special computer methods
9,260
004 - Data processing & computer science
3,524
005 - Computer programming, programs & data
3,247
600 - Technology
971
621 - Applied physics
950
658 - General management
804
620 - Engineering & allied operations
803
700 - The arts; fine & decorative arts
706
629 - Other branches of engineering
681
000 - Computer science, information & general works
549
500 - Natural sciences & mathematics
540
610 - Medicine & health
456
330 - Economics
455
003 - Systems
439
518 - Numerical analysis
330
025 - Library operations
285
331 - Labor economics
242
338 - Production
230
519 - Probabilities & applied mathematics
222
670 - Manufacturing
215
333 - Economics of land & energy
206
900 - History & geography
179
371 - Schools & their activities; special education
164
616 - Diseases
153
570 - Life sciences; biology
135
511 - General principles of mathematics
130
303 - Social processes
124
380 - Commerce, communications & transportation
124
363 - Other social problems & services
121
140 - Specific philosophical schools
120
300 - Social sciences
117
320 - Political science
114
370 - Education
114
530 - Physics
110
153 - Mental processes & intelligence
106
612 - Human physiology
83
340 - Law
82
576 - Genetics & evolution
77
381 - Commerce
76
302 - Social interaction
72
304 - Factors affecting social behavior
71
332 - Financial economics
70
410 - Linguistics
70
160 - Logic
68
100 - Philosophy & psychology
67
650 - Management & auxiliary services
66
510 - Mathematics
65
551 - Geology, hydrology & meteorology
61
630 - Agriculture & related technologies
61
170 - Ethics
60
more ...