Classification
530 - Physics
269
620 - Engineering & allied operations
256
600 - Technology
108
551 - Geology, hydrology & meteorology
106
700 - The arts; fine & decorative arts
94
333 - Economics of land & energy
89
621 - Applied physics
86
531 - Classical mechanics; solid mechanics
85
515 - Analysis
84
000 - Computer science, information & general works
83
900 - History & geography
78
520 - Astronomy & allied sciences
63
363 - Other social problems & services
55
006 - Special computer methods
54
523 - Specific celestial bodies & phenomena
53
519 - Probabilities & applied mathematics
52
500 - Natural sciences & mathematics
46
577 - Ecology
41
539 - Modern physics
40
550 - Earth sciences
40
660 - Chemical engineering
40
380 - Commerce, communications & transportation
33
541 - Physical chemistry
31
532 - Fluid mechanics; liquid mechanics
28
536 - Heat
24
576 - Genetics & evolution
23
330 - Economics
22
518 - Numerical analysis
21
616 - Diseases
21
571 - Physiology & related subjects
20
001 - Knowledge
19
300 - Social sciences
19
624 - Civil engineering
19
003 - Systems
18
540 - Chemistry & allied sciences
17
004 - Data processing & computer science
16
627 - Hydraulic engineering
16
910 - Geography & travel
16
572 - Biochemistry
15
629 - Other branches of engineering
15
510 - Mathematics
14
580 - Plants (Botany)
14
610 - Medicine & health
14
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 ...