Classification
610 - Medicine & health
56
370 - Education
39
700 - The arts; fine & decorative arts
39
333 - Economics of land & energy
22
140 - Specific philosophical schools
20
363 - Other social problems & services
19
000 - Computer science, information & general works
17
300 - Social sciences
17
330 - Economics
16
600 - Technology
16
100 - Philosophy & psychology
13
380 - Commerce, communications & transportation
13
500 - Natural sciences & mathematics
12
170 - Ethics
11
900 - History & geography
11
001 - Knowledge
10
320 - Political science
10
620 - Engineering & allied operations
6
361 - Social problems & social welfare in general
5
658 - General management
5
200 - Religion
4
301 - Sociology & anthropology
4
400 - Language
4
551 - Geology, hydrology & meteorology
4
304 - Factors affecting social behavior
3
519 - Probabilities & applied mathematics
3
540 - Chemistry & allied sciences
3
580 - Plants (Botany)
3
720 - Architecture
3
005 - Computer programming, programs & data
2
410 - Linguistics
2
581 - Specific topics in natural history
2
657 - Accounting
2
780 - Music
2
800 - Literature & rhetoric
2
150 - Psychology
1
155 - Differential & developmental psychology
1
160 - Logic
1
174 - Occupational ethics
1
297 - Islam, Babism & Bahai Faith
1
302 - Social interaction
1
305 - Social groups
1
306 - Culture & institutions
1
340 - Law
1
360 - Social problems & services; associations
1
362 - Social welfare problems & services
1
371 - Schools & their activities; special education
1
381 - Commerce
1
510 - Mathematics
1
520 - Astronomy & allied sciences
1
more ...