Classification
507 - Education, research & related topics
252
370 - Education
205
371 - Schools & their activities; special education
54
500 - Natural sciences & mathematics
47
530 - Physics
44
005 - Computer programming, programs & data
35
333 - Economics of land & energy
34
540 - Chemistry & allied sciences
34
600 - Technology
34
006 - Special computer methods
32
004 - Data processing & computer science
30
610 - Medicine & health
29
620 - Engineering & allied operations
28
621 - Applied physics
25
300 - Social sciences
21
510 - Mathematics
21
304 - Factors affecting social behavior
19
700 - The arts; fine & decorative arts
19
330 - Economics
18
378 - Higher education
18
140 - Specific philosophical schools
15
306 - Culture & institutions
15
000 - Computer science, information & general works
14
303 - Social processes
13
400 - Language
13
363 - Other social problems & services
12
100 - Philosophy & psychology
11
320 - Political science
11
570 - Life sciences; biology
11
520 - Astronomy & allied sciences
10
658 - General management
10
910 - Geography & travel
10
501 - Philosophy & theory
9
551 - Geology, hydrology & meteorology
9
380 - Commerce, communications & transportation
8
302 - Social interaction
7
641 - Food & drink
7
650 - Management & auxiliary services
7
660 - Chemical engineering
7
664 - Food technology
7
003 - Systems
6
153 - Mental processes & intelligence
6
305 - Social groups
6
340 - Law
6
374 - Adult education
6
531 - Classical mechanics; solid mechanics
6
612 - Human physiology
6
001 - Knowledge
5
020 - Library & information sciences
5
338 - Production
5
more ...