What are the 2 library classification?

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Tags

1. #classification
2. #dewey
3. #congress
4. #systems
5. #include
6. #research
7. #current
8. #library
9. #bliss
10. #unique
11. #devise
12. #colon
13. #libraries
14. #decimal
15. #their
16. #special
17. #predominating