Classification
621 - Applied physics
109
333 - Economics of land & energy
71
620 - Engineering & allied operations
67
600 - Technology
39
700 - The arts; fine & decorative arts
29
900 - History & geography
26
000 - Computer science, information & general works
20
380 - Commerce, communications & transportation
16
363 - Other social problems & services
11
541 - Physical chemistry
10
530 - Physics
9
140 - Specific philosophical schools
8
330 - Economics
8
610 - Medicine & health
7
580 - Plants (Botany)
5
414 - Phonology & phonetics
4
551 - Geology, hydrology & meteorology
4
720 - Architecture
4
800 - Literature & rhetoric
4
576 - Genetics & evolution
3
629 - Other branches of engineering
3
658 - General management
3
006 - Special computer methods
2
100 - Philosophy & psychology
2
320 - Political science
2
340 - Law
2
400 - Language
2
540 - Chemistry & allied sciences
2
571 - Physiology & related subjects
2
624 - Civil engineering
2
628 - Sanitary & municipal engineering
2
630 - Agriculture & related technologies
2
662 - Explosives, fuels & related products
2
120 - Epistemology, causation & humankind
1
304 - Factors affecting social behavior
1
331 - Labor economics
1
338 - Production
1
341 - Law of nations
1
370 - Education
1
384 - Communications; telecommunication
1
500 - Natural sciences & mathematics
1
534 - Sound & related vibrations
1
535 - Light & infrared & ultraviolet phenomena
1
543 - Analytical chemistry
1
570 - Life sciences; biology
1
627 - Hydraulic engineering
1
681 - Precision instruments & other devices
1
696 - Utilities
1
910 - Geography & travel
1