We would first and foremost like to thank NCUR/LANCY for funding this project. Support was also provided by an grant research grant to St. Olaf College from an HHMI and an NSF MRI award (0520803).

We would also like to thank the numerous others who helped make our research possible:

  • Juliette Arai, National Archives
  • Ellen Alers and Tammy Peters, Smithsonian Archives
  • Len Bruno, Library of Congress
  • Brian Carter-Stiglitz, Institute for Rock Magnetism, University of Minnesota
  • Jon Christensen and Mike Hawkins, Iowa DNR
  • Anita Cholewa, University of Minnesota Herbarium
  • Daniel Edwins, Northfield, MN
  • Dan Engstrom, St. Croix Research Station, Science Museum of Minnesota
  • Wayne Feder, Blue Earth, MN
  • Alina Freire-Fierro and Charlie Nicholson, Phil. Academy of Science Herbarium
  • Rusty Russell and Linda Hollenberg, U.S. National Herbarium
  • Rice County Historical Society
  • Nat Schaefle, Northfield, MN
  • Jim Solomon, Missouri Botanical Garden Herbarium
  • The Sonnabend Family, Amboy, MN
  • Stella Sylva & Jacquelyn Kallunki, New York Botanical Garden Herbarium
  • Edith Walter, Washington, DC
  • Judy Wehrspann and staff, Iowa Lakeside Laboratory
  • Emily Wood, Harvard University Herbarium