University of Colorado, College of Architecture and Planning No description specified. 1-2 (2 Records) Documents Boulder Valley Dicthes Historical Survey Report: Anderson Ditch (5Bl3935) Farmers Ditch (5Bl6632) Silver Lake Ditch (5Bl3813) (Shf# 96-M2-058) (2000) History of Boulder, Colorado's Pearl Street Mall (1998)