Why is a4 called a4?

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Tags

1. #series
2. #prescribed
3. #sizes
4. #labelled
5. #called
6. #sequence
7. #sheets
8. #paper
9. #standards
10. #three
11. #standard
12. #decreases
13. #organisation
14. #sheet
15. #international
16. #different
17. #largest