Classification
650 - Management & auxiliary services
49
340 - Law
43
658 - General management
40
300 - Social sciences
39
306 - Culture & institutions
38
616 - Diseases
32
900 - History & geography
30
320 - Political science
25
620 - Engineering & allied operations
23
629 - Other branches of engineering
19
301 - Sociology & anthropology
13
304 - Factors affecting social behavior
12
621 - Applied physics
12
690 - Buildings
12
305 - Social groups
11
338 - Production
11
370 - Education
11
610 - Medicine & health
11
800 - Literature & rhetoric
11
302 - Social interaction
10
361 - Social problems & social welfare in general
10
150 - Psychology
9
330 - Economics
9
400 - Language
9
657 - Accounting
9
697 - Heating, ventilating & air-conditioning
9
003 - Systems
8
333 - Economics of land & energy
8
617 - Surgery & related medical specialties
8
100 - Philosophy & psychology
7
158 - Applied psychology
6
332 - Financial economics
6
624 - Civil engineering
6
004 - Data processing & computer science
5
327 - International relations
5
363 - Other social problems & services
5
410 - Linguistics
5
510 - Mathematics
5
530 - Physics
5
700 - The arts; fine & decorative arts
5
001 - Knowledge
4
005 - Computer programming, programs & data
4
128 - Humankind
4
155 - Differential & developmental psychology
4
344 - Labor, social, education & cultural law
4
345 - Criminal law
4
362 - Social welfare problems & services
4
491 - East Indo-European & Celtic languages
4
512 - Algebra
4
570 - Life sciences; biology
4
more ...