Classification
620 - Engineering & allied operations
2,107
500 - Natural sciences & mathematics
1,787
005 - Computer programming, programs & data
994
384 - Communications; telecommunication
465
658 - General management
410
331 - Labor economics
405
621 - Applied physics
302
006 - Special computer methods
277
004 - Data processing & computer science
276
000 - Computer science, information & general works
264
745 - Decorative arts
190
600 - Technology
135
330 - Economics
113
374 - Adult education
108
519 - Probabilities & applied mathematics
83
515 - Analysis
81
333 - Economics of land & energy
74
629 - Other branches of engineering
74
610 - Medicine & health
70
530 - Physics
67
363 - Other social problems & services
56
660 - Chemical engineering
47
700 - The arts; fine & decorative arts
46
003 - Systems
43
338 - Production
42
900 - History & geography
41
300 - Social sciences
39
670 - Manufacturing
35
540 - Chemistry & allied sciences
32
302 - Social interaction
31
624 - Civil engineering
31
510 - Mathematics
27
541 - Physical chemistry
25
551 - Geology, hydrology & meteorology
24
001 - Knowledge
23
381 - Commerce
22
304 - Factors affecting social behavior
21
531 - Classical mechanics; solid mechanics
20
340 - Law
19
650 - Management & auxiliary services
19
770 - Photography, photographs & computer art
19
370 - Education
18
616 - Diseases
18
580 - Plants (Botany)
17
570 - Life sciences; biology
16
332 - Financial economics
15
306 - Culture & institutions
14
690 - Buildings
14
720 - Architecture
14
380 - Commerce, communications & transportation
13
more ...