Classification
620 - Engineering & allied operations
1,072
621 - Applied physics
296
600 - Technology
250
700 - The arts; fine & decorative arts
250
000 - Computer science, information & general works
240
333 - Economics of land & energy
187
530 - Physics
177
900 - History & geography
148
610 - Medicine & health
123
629 - Other branches of engineering
106
531 - Classical mechanics; solid mechanics
99
532 - Fluid mechanics; liquid mechanics
91
363 - Other social problems & services
85
380 - Commerce, communications & transportation
77
500 - Natural sciences & mathematics
61
580 - Plants (Botany)
55
515 - Analysis
52
540 - Chemistry & allied sciences
52
660 - Chemical engineering
52
140 - Specific philosophical schools
50
576 - Genetics & evolution
50
330 - Economics
48
551 - Geology, hydrology & meteorology
35
533 - Gas mechanics
33
340 - Law
32
003 - Systems
27
518 - Numerical analysis
25
414 - Phonology & phonetics
24
624 - Civil engineering
24
536 - Heat
23
519 - Probabilities & applied mathematics
22
304 - Factors affecting social behavior
20
628 - Sanitary & municipal engineering
20
720 - Architecture
18
550 - Earth sciences
15
630 - Agriculture & related technologies
15
541 - Physical chemistry
14
571 - Physiology & related subjects
13
800 - Literature & rhetoric
13
320 - Political science
12
670 - Manufacturing
12
534 - Sound & related vibrations
11
510 - Mathematics
10
612 - Human physiology
10
370 - Education
9
581 - Specific topics in natural history
8
400 - Language
7
526 - Mathematical geography
7
543 - Analytical chemistry
7
570 - Life sciences; biology
7
more ...