Personal communication with Dale Bartos, Rocky Mountain Research Station, Logan, Utah, and Wayne Shepperd, Rocky Mountain Research Station, Fort Collins, Colorado
Ferguson, Brian; Bartos, Dale; and Shepperd, Wayne, "Development of New Aspen Cohorts: How Many Suckers Create an Adequate Condition and the Relationship with Ungulate Impacts?" (2004). Aspen Bibliography. Paper 3482.