A blue ring dating to 1902 (IMAGE)

Frontiers

A blue ring dating to 1902

Caption

A blue ring formed in 1902 in a tree in northern Norway. Image by Pawel Matulewski and Liliana Siekacz.

Credit

Image by Pawel Matulewski and Liliana Siekacz.

Usage Restrictions

Image owned and provided by the authors and must be credited to Pawel Matulewski and Liliana Siekacz.

License

Original content

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