Classification
620 - Engineering & allied operations
4,246
621 - Applied physics
3,066
531 - Classical mechanics; solid mechanics
1,037
600 - Technology
854
700 - The arts; fine & decorative arts
771
530 - Physics
765
006 - Special computer methods
700
333 - Economics of land & energy
644
629 - Other branches of engineering
591
900 - History & geography
505
000 - Computer science, information & general works
495
610 - Medicine & health
401
330 - Economics
318
363 - Other social problems & services
266
003 - Systems
260
624 - Civil engineering
255
500 - Natural sciences & mathematics
249
515 - Analysis
230
580 - Plants (Botany)
215
670 - Manufacturing
204
380 - Commerce, communications & transportation
200
540 - Chemistry & allied sciences
177
519 - Probabilities & applied mathematics
173
320 - Political science
159
576 - Genetics & evolution
157
690 - Buildings
151
140 - Specific philosophical schools
139
658 - General management
137
660 - Chemical engineering
128
340 - Law
108
551 - Geology, hydrology & meteorology
100
414 - Phonology & phonetics
98
541 - Physical chemistry
90
510 - Mathematics
86
630 - Agriculture & related technologies
77
384 - Communications; telecommunication
76
518 - Numerical analysis
75
536 - Heat
73
745 - Decorative arts
72
520 - Astronomy & allied sciences
68
720 - Architecture
62
547 - Organic chemistry
58
691 - Building materials
54
370 - Education
53
004 - Data processing & computer science
49
304 - Factors affecting social behavior
49
612 - Human physiology
49
534 - Sound & related vibrations
45
331 - Labor economics
41
615 - Pharmacology & therapeutics
40
more ...