Classification
600 - Technology
40
700 - The arts; fine & decorative arts
32
620 - Engineering & allied operations
31
000 - Computer science, information & general works
25
333 - Economics of land & energy
23
900 - History & geography
17
610 - Medicine & health
16
540 - Chemistry & allied sciences
15
580 - Plants (Botany)
15
547 - Organic chemistry
10
330 - Economics
9
363 - Other social problems & services
9
414 - Phonology & phonetics
6
546 - Inorganic chemistry
6
380 - Commerce, communications & transportation
5
576 - Genetics & evolution
5
500 - Natural sciences & mathematics
4
541 - Physical chemistry
4
630 - Agriculture & related technologies
4
530 - Physics
3
140 - Specific philosophical schools
2
551 - Geology, hydrology & meteorology
2
572 - Biochemistry
2
581 - Specific topics in natural history
2
612 - Human physiology
2
621 - Applied physics
2
304 - Factors affecting social behavior
1
340 - Law
1
543 - Analytical chemistry
1
549 - Mineralogy
1
616 - Diseases
1
660 - Chemical engineering
1
668 - Technology of other organic products
1
720 - Architecture
1