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Elaine Cooper interview; Vince Yannon interview; Joseph Daugherty interview
Cooper, Elaine; Yannon, Vince; Daugherty, Joseph, Elaine Cooper interview; Vince Yannon interview; Joseph Daugherty interview (1973-09-19 and 1973-10-01). Montana History Portal, accessed 17/06/2025, https://www.mtmemory.org/nodes/view/91957