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- May 21, 2018.
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Author Information
- aDepartment of Plant Biology, University of Vermont
- bDepartment of Paleobiology, Smithsonian Institution, National Museum of Natural History
- cAmazon.com, Inc
- Corresponding author: Karl C. Fetter (e-mail: kf{at}uvm.edu, tel: +1 802 656 2930)
↵1 S.E. and K.F. contributed equally to this work