Photo of Ken Friedman in front of the installation of Omaha Flow Systems
Article
Bresette, James: Perfect Irony. Postal System Is Shaping Art Show, Omaha World-Herald, Omaha, Nebraska, USA, 16 April, 1973
Article
Olten, Carol: Art World: A Four-In-One Show, The San Diego Union, October 14, 1973, pp. 7–8.