Classification
600 - Technology
2,042
330 - Economics
652
621 - Applied physics
529
620 - Engineering & allied operations
302
320 - Political science
284
363 - Other social problems & services
256
333 - Economics of land & energy
177
304 - Factors affecting social behavior
159
610 - Medicine & health
158
303 - Social processes
148
370 - Education
132
006 - Special computer methods
83
629 - Other branches of engineering
83
380 - Commerce, communications & transportation
75
658 - General management
63
300 - Social sciences
62
630 - Agriculture & related technologies
59
005 - Computer programming, programs & data
58
530 - Physics
47
306 - Culture & institutions
43
500 - Natural sciences & mathematics
38
519 - Probabilities & applied mathematics
34
670 - Manufacturing
34
900 - History & geography
34
003 - Systems
32
000 - Computer science, information & general works
28
540 - Chemistry & allied sciences
28
700 - The arts; fine & decorative arts
28
004 - Data processing & computer science
25
581 - Specific topics in natural history
23
551 - Geology, hydrology & meteorology
21
301 - Sociology & anthropology
20
336 - Public finance
20
140 - Specific philosophical schools
19
624 - Civil engineering
18
100 - Philosophy & psychology
17
302 - Social interaction
15
340 - Law
15
660 - Chemical engineering
15
664 - Food technology
13
690 - Buildings
13
338 - Production
12
628 - Sanitary & municipal engineering
12
641 - Food & drink
12
170 - Ethics
11
305 - Social groups
11
539 - Modern physics
10
361 - Social problems & social welfare in general
8
515 - Analysis
7
571 - Physiology & related subjects
7
more ...