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Published May 12, 2012, 12:00 AM

Steven Travers

Steven Travers shows some of the plants that have been preserved and recorded and are in storage in the herbarium at North Dakota State University. In 67 years at NDSU, O.A. Stevens meticulously recorded data on the state’s plant life. Now, more than 100 years after he first began his work, the late botanist’s work has turned into a gold mine for a big study on climate change being published in Nature. Dave Wallis / The Forum
Read the article: Mining the past for clues on climate change