Did the Vikings use crystal 'sunstones' to discover America?

Did the Vikings use crystal 'sunstones' to discover America?

Bibliographic Details
Main Author: Harding, Stephen E.
Format: Article
Published: Conversation Trust (UK) Limited 2016
Online Access:https://eprints.nottingham.ac.uk/41711/

Internet

https://eprints.nottingham.ac.uk/41711/

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