Classification
600 - Technology
2,063
330 - Economics
673
621 - Applied physics
547
620 - Engineering & allied operations
319
320 - Political science
298
363 - Other social problems & services
258
333 - Economics of land & energy
184
304 - Factors affecting social behavior
168
610 - Medicine & health
166
303 - Social processes
159
370 - Education
140
629 - Other branches of engineering
92
380 - Commerce, communications & transportation
75
658 - General management
64
630 - Agriculture & related technologies
59
005 - Computer programming, programs & data
58
300 - Social sciences
58
530 - Physics
47
006 - Special computer methods
44
306 - Culture & institutions
44
500 - Natural sciences & mathematics
38
519 - Probabilities & applied mathematics
34
670 - Manufacturing
34
900 - History & geography
34
000 - Computer science, information & general works
28
003 - Systems
28
540 - Chemistry & allied sciences
28
700 - The arts; fine & decorative arts
28
004 - Data processing & computer science
25
301 - Sociology & anthropology
25
581 - Specific topics in natural history
23
551 - Geology, hydrology & meteorology
21
336 - Public finance
20
140 - Specific philosophical schools
19
624 - Civil engineering
19
100 - Philosophy & psychology
17
302 - Social interaction
16
660 - Chemical engineering
16
340 - Law
15
664 - Food technology
13
690 - Buildings
13
305 - Social groups
12
338 - Production
12
628 - Sanitary & municipal engineering
12
641 - Food & drink
12
170 - Ethics
11
539 - Modern physics
10
361 - Social problems & social welfare in general
8
327 - International relations
7
515 - Analysis
7
more ...