Classification
658 - General management
331 - Labor economics
60
384 - Communications; telecommunication
37
004 - Data processing & computer science
36
374 - Adult education
36
000 - Computer science, information & general works
27
500 - Natural sciences & mathematics
14
620 - Engineering & allied operations
12
700 - The arts; fine & decorative arts
11
333 - Economics of land & energy
10
600 - Technology
10
380 - Commerce, communications & transportation
9
576 - Genetics & evolution
9
005 - Computer programming, programs & data
7
330 - Economics
6
610 - Medicine & health
6
363 - Other social problems & services
5
140 - Specific philosophical schools
4
530 - Physics
2
630 - Agriculture & related technologies
2
900 - History & geography
2
300 - Social sciences
1
320 - Political science
1
361 - Social problems & social welfare in general
1
370 - Education
1
510 - Mathematics
1
520 - Astronomy & allied sciences
1
580 - Plants (Botany)
1
621 - Applied physics
1
720 - Architecture
1
745 - Decorative arts
1
780 - Music
1
800 - Literature & rhetoric
1