Classification
540 - Chemistry & allied sciences
99
333 - Economics of land & energy
22
700 - The arts; fine & decorative arts
22
600 - Technology
21
620 - Engineering & allied operations
21
000 - Computer science, information & general works
14
530 - Physics
8
900 - History & geography
8
363 - Other social problems & services
7
380 - Commerce, communications & transportation
5
414 - Phonology & phonetics
4
610 - Medicine & health
4
500 - Natural sciences & mathematics
3
546 - Inorganic chemistry
3
548 - Crystallography
3
140 - Specific philosophical schools
2
576 - Genetics & evolution
2
304 - Factors affecting social behavior
1
330 - Economics
1
340 - Law
1
537 - Electricity & electronics
1
538 - Magnetism
1
539 - Modern physics
1
541 - Physical chemistry
1
543 - Analytical chemistry
1
547 - Organic chemistry
1
572 - Biochemistry
1
580 - Plants (Botany)
1
615 - Pharmacology & therapeutics
1
629 - Other branches of engineering
1
661 - Industrial chemicals
1
686 - Printing & related activities
1
800 - Literature & rhetoric
1