"All About the Arboretum"(PDF). Papio-Missouri River Natural Resources District. Archived from the original(PDF) on June 13, 2004. Retrieved 2007-01-24.
"All About the Arboretum"(PDF). Papio-Missouri River Natural Resources District. Archived from the original(PDF) on June 13, 2004. Retrieved 2007-01-24.