Classification
620 - Engineering & allied operations
288
530 - Physics
269
600 - Technology
108
551 - Geology, hydrology & meteorology
106
621 - Applied physics
99
700 - The arts; fine & decorative arts
94
333 - Economics of land & energy
90
531 - Classical mechanics; solid mechanics
85
515 - Analysis
84
000 - Computer science, information & general works
83
900 - History & geography
78
520 - Astronomy & allied sciences
64
363 - Other social problems & services
56
519 - Probabilities & applied mathematics
53
523 - Specific celestial bodies & phenomena
52
500 - Natural sciences & mathematics
48
577 - Ecology
41
660 - Chemical engineering
40
539 - Modern physics
39
550 - Earth sciences
39
380 - Commerce, communications & transportation
33
541 - Physical chemistry
32
532 - Fluid mechanics; liquid mechanics
31
536 - Heat
24
004 - Data processing & computer science
23
576 - Genetics & evolution
23
330 - Economics
22
616 - Diseases
22
518 - Numerical analysis
21
624 - Civil engineering
21
571 - Physiology & related subjects
20
001 - Knowledge
17
300 - Social sciences
17
540 - Chemistry & allied sciences
17
627 - Hydraulic engineering
16
910 - Geography & travel
16
003 - Systems
15
572 - Biochemistry
15
629 - Other branches of engineering
15
510 - Mathematics
14
580 - Plants (Botany)
14
610 - Medicine & health
14
006 - Special computer methods
12
140 - Specific philosophical schools
11
628 - Sanitary & municipal engineering
11
340 - Law
10
414 - Phonology & phonetics
10
670 - Manufacturing
10
005 - Computer programming, programs & data
9
570 - Life sciences; biology
9
more ...