Classification
380 - Commerce, communications & transportation
330 - Economics
9
600 - Technology
8
620 - Engineering & allied operations
8
900 - History & geography
8
000 - Computer science, information & general works
6
333 - Economics of land & energy
6
384 - Communications; telecommunication
6
700 - The arts; fine & decorative arts
6
302 - Social interaction
4
140 - Specific philosophical schools
3
658 - General management
3
150 - Psychology
2
153 - Mental processes & intelligence
2
300 - Social sciences
2
331 - Labor economics
2
500 - Natural sciences & mathematics
2
610 - Medicine & health
2
004 - Data processing & computer science
1
155 - Differential & developmental psychology
1
306 - Culture & institutions
1
320 - Political science
1
340 - Law
1
363 - Other social problems & services
1
364 - Criminology
1
370 - Education
1
400 - Language
1
530 - Physics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1
720 - Architecture
1
745 - Decorative arts
1
800 - Literature & rhetoric
1