When authorities have difficulties linking physical evidence to Bruno Hauptmann in the Charles Lindbergh Jr. abduction and murder, Arthur Koehler, an expert on wood, helps them connect Hauptmann to the ladder left outside the Lindbergh family estate on March 1st, 1932.

My guest is Adam Schrager, author of "The Sixteenth Rail: The Evidence, the Scientist, and the Lindbergh Kidnapping".

The author on Twitter: https://twitter.com/aschrager

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