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Tree rings : the tree ring calendar
Diagram shows tree ring patterns and corresponding years.
8.2 x 20.1 cm
black and white
- still image
- These materials are either in the public domain, according to U.S. copyright law, or permission has been obtained from rights owners. The digital version and supplementary materials are available for all educational uses worldwide.
- The Janet A. Ginsburg Chicago Tribune Image Collection
- Chicago Sunday Tribune (March 10, 1935), Part 7, p. 11