Classification
621 - Applied physics
620 - Engineering & allied operations
1,098
004 - Data processing & computer science
605
384 - Communications; telecommunication
480
745 - Decorative arts
306
331 - Labor economics
179
500 - Natural sciences & mathematics
151
333 - Economics of land & energy
108
658 - General management
98
781 - General principles & musical forms
84
535 - Light & infrared & ultraviolet phenomena
74
338 - Production
55
510 - Mathematics
48
374 - Adult education
31
000 - Computer science, information & general works
28
006 - Special computer methods
25
330 - Economics
18
600 - Technology
17
629 - Other branches of engineering
14
302 - Social interaction
12
005 - Computer programming, programs & data
11
770 - Photography, photographs & computer art
11
381 - Commerce
8
153 - Mental processes & intelligence
7
519 - Probabilities & applied mathematics
6
532 - Fluid mechanics; liquid mechanics
6
602 - Miscellany
6
790 - Recreational & performing arts
6
364 - Criminology
5
681 - Precision instruments & other devices
5
011 - Bibliographies
4
363 - Other social problems & services
4
530 - Physics
4
541 - Physical chemistry
4
610 - Medicine & health
4
670 - Manufacturing
4
777 - [Unassigned]
4
300 - Social sciences
3
643 - Housing & household equipment
3
003 - Systems
2
025 - Library operations
2
304 - Factors affecting social behavior
2
537 - Electricity & electronics
2
539 - Modern physics
2
623 - Military & nautical engineering
2
650 - Management & auxiliary services
2
660 - Chemical engineering
2
686 - Printing & related activities
2
696 - Utilities
2
697 - Heating, ventilating & air-conditioning
2
more ...