Classification
333 - Economics of land & energy
5
580 - Plants (Botany)
3
581 - Specific topics in natural history
3
003 - Systems
2
363 - Other social problems & services
2
414 - Phonology & phonetics
2
540 - Chemistry & allied sciences
2
591 - Specific topics in natural history
2
000 - Computer science, information & general works
1
305 - Social groups
1
550 - Earth sciences
1
570 - Life sciences; biology
1
572 - Biochemistry
1
576 - Genetics & evolution
1
577 - Ecology
1
600 - Technology
1
615 - Pharmacology & therapeutics
1
620 - Engineering & allied operations
1
641 - Food & drink
1
664 - Food technology
1
900 - History & geography
1
910 - Geography & travel
1