How many black albums has Metallica sold?

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Tags

1. #shipping
2. #industry
3. #certified
4. #physical
5. #million
6. #platinum
7. #media
8. #moved
9. #metallica
10. #worldwide
11. #sixteen
12. #average
13. #album
14. #association
15. #never
16. #recording
17. #weekly
18. #america
19. #copies