Classification
333 - Economics of land & energy
52
621 - Applied physics
50
620 - Engineering & allied operations
47
539 - Modern physics
18
006 - Special computer methods
14
005 - Computer programming, programs & data
12
530 - Physics
11
515 - Analysis
10
363 - Other social problems & services
8
541 - Physical chemistry
8
500 - Natural sciences & mathematics
7
658 - General management
7
001 - Knowledge
5
300 - Social sciences
5
330 - Economics
5
519 - Probabilities & applied mathematics
5
540 - Chemistry & allied sciences
5
600 - Technology
5
000 - Computer science, information & general works
4
580 - Plants (Botany)
4
610 - Medicine & health
4
003 - Systems
3
510 - Mathematics
3
551 - Geology, hydrology & meteorology
3
629 - Other branches of engineering
3
700 - The arts; fine & decorative arts
3
004 - Data processing & computer science
2
518 - Numerical analysis
2
520 - Astronomy & allied sciences
2
571 - Physiology & related subjects
2
624 - Civil engineering
2
650 - Management & auxiliary services
2
660 - Chemical engineering
2
670 - Manufacturing
2
040 - [Unassigned]
1
155 - Differential & developmental psychology
1
320 - Political science
1
324 - The political process
1
327 - International relations
1
331 - Labor economics
1
340 - Law
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
509 - Historical, geographic & persons treatment
1
531 - Classical mechanics; solid mechanics
1
532 - Fluid mechanics; liquid mechanics
1
546 - Inorganic chemistry
1
550 - Earth sciences
1
574 - [Unassigned]
1
577 - Ecology
1
more ...