A swimmer makes a flip turn at Spruce Pool in Boulder, CO . 9/5/2004 RMN photo by Sonya Doctorian for Summer Escapes

A swimmer makes a flip turn at Spruce Pool in Boulder, CO . 9/5/2004 RMN photo by Sonya Doctorian for Summer Escapes, [431769546] . Denver Public Library Digital Collections, accessed 18/08/2026, https://digital.denverlibrary.org/nodes/view/734434