Classification
620 - Engineering & allied operations
600 - Technology
40
900 - History & geography
32
621 - Applied physics
21
333 - Economics of land & energy
20
700 - The arts; fine & decorative arts
18
000 - Computer science, information & general works
11
500 - Natural sciences & mathematics
11
380 - Commerce, communications & transportation
8
610 - Medicine & health
8
331 - Labor economics
6
363 - Other social problems & services
6
384 - Communications; telecommunication
6
140 - Specific philosophical schools
5
530 - Physics
4
580 - Plants (Botany)
4
629 - Other branches of engineering
4
540 - Chemistry & allied sciences
3
576 - Genetics & evolution
3
630 - Agriculture & related technologies
3
658 - General management
3
004 - Data processing & computer science
2
005 - Computer programming, programs & data
2
006 - Special computer methods
2
320 - Political science
2
370 - Education
2
414 - Phonology & phonetics
2
510 - Mathematics
2
547 - Organic chemistry
2
551 - Geology, hydrology & meteorology
2
660 - Chemical engineering
2
745 - Decorative arts
2
003 - Systems
1
304 - Factors affecting social behavior
1
338 - Production
1
340 - Law
1
361 - Social problems & social welfare in general
1
400 - Language
1
541 - Physical chemistry
1
581 - Specific topics in natural history
1
616 - Diseases
1
624 - Civil engineering
1
628 - Sanitary & municipal engineering
1
657 - Accounting
1
662 - Explosives, fuels & related products
1
681 - Precision instruments & other devices
1
720 - Architecture
1