Classification
621 - Applied physics
620 - Engineering & allied operations
1,061
384 - Communications; telecommunication
466
745 - Decorative arts
301
331 - Labor economics
173
500 - Natural sciences & mathematics
148
658 - General management
91
781 - General principles & musical forms
84
338 - Production
50
510 - Mathematics
48
374 - Adult education
31
000 - Computer science, information & general works
28
333 - Economics of land & energy
28
006 - Special computer methods
26
004 - Data processing & computer science
20
330 - Economics
18
600 - Technology
17
629 - Other branches of engineering
14
302 - Social interaction
13
005 - Computer programming, programs & data
11
770 - Photography, photographs & computer art
11
381 - Commerce
8
153 - Mental processes & intelligence
6
519 - Probabilities & applied mathematics
6
790 - Recreational & performing arts
6
364 - Criminology
5
681 - Precision instruments & other devices
5
363 - Other social problems & services
4
530 - Physics
4
610 - Medicine & health
4
777 - [Unassigned]
4
011 - Bibliographies
3
300 - Social sciences
3
643 - Housing & household equipment
3
670 - Manufacturing
3
003 - Systems
2
304 - Factors affecting social behavior
2
623 - Military & nautical engineering
2
660 - Chemical engineering
2
686 - Printing & related activities
2
696 - Utilities
2
791 - Public performances
2
800 - Literature & rhetoric
2
025 - Library operations
1
303 - Social processes
1
321 - Systems of governments & states
1
380 - Commerce, communications & transportation
1
387 - Water, air & space transportation
1
511 - General principles of mathematics
1
515 - Analysis
1
more ...