The Riley County web site has some information about the exhibit.
Spotted on the Manhattan Mercury web site:
"The Tallgrass Prairie. Panel exhibit developed by the Smithsonian Institution and is at the Riley County Historical Museum courtesy of Kansas State University. For more information, call (785)565-6490. Riley County Historical Museum, 2309 Claflin Road, 8:30 a.m.-5 p.m. Tuesday-Friday and 2-5 p.m. Saturday and Sunday."