Classification
006 - Special computer methods
55
003 - Systems
53
620 - Engineering & allied operations
31
005 - Computer programming, programs & data
20
519 - Probabilities & applied mathematics
19
621 - Applied physics
16
629 - Other branches of engineering
15
333 - Economics of land & energy
11
551 - Geology, hydrology & meteorology
11
004 - Data processing & computer science
10
530 - Physics
10
531 - Classical mechanics; solid mechanics
8
658 - General management
8
550 - Earth sciences
7
670 - Manufacturing
7
000 - Computer science, information & general works
6
518 - Numerical analysis
6
700 - The arts; fine & decorative arts
5
304 - Factors affecting social behavior
4
338 - Production
4
600 - Technology
4
610 - Medicine & health
4
624 - Civil engineering
4
900 - History & geography
4
515 - Analysis
3
553 - Economic geology
3
570 - Life sciences; biology
3
140 - Specific philosophical schools
2
374 - Adult education
2
501 - Philosophy & theory
2
526 - Mathematical geography
2
539 - Modern physics
2
628 - Sanitary & municipal engineering
2
025 - Library operations
1
110 - Metaphysics
1
301 - Sociology & anthropology
1
320 - Political science
1
330 - Economics
1
363 - Other social problems & services
1
370 - Education
1
371 - Schools & their activities; special education
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
502 - Miscellany
1
516 - Geometry
1
523 - Specific celestial bodies & phenomena
1
540 - Chemistry & allied sciences
1
572 - Biochemistry
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
more ...