University of Montana Mansfield Library. “Captain John Mullan Reading a Book.” Photograph. Helen Addison Howard Collection, photo no. 78.0319, local identifier umt010498. Archival Photographs from the University of Montana, University of Montana Mansfield Library. Montana History Portal. Accessed September 3, 2026. Montana History Portal

Underwood & Underwood. “Portrait of Captain John Mullan.” Photograph. Helen Addison Howard Collection, photo no. 78.0316, local identifier umt010495. Archival Photographs from the University of Montana, University of Montana Mansfield Library. Montana History Portal. Accessed September 3, 2026. Montana History Portal record

University of Montana Mansfield Library. “Portrait of Captain John Mullan.” Photograph. Archival Photographs from the University of Montana, Helen Addison Howard Collection, photo no. 78.0318, local identifier umt010497. Montana History Portal. Accessed September 3, 2026. Montana History Portal record

Underwood & Underwood. “Portrait of Captain John Mullan.” Photograph. Helen Addison Howard Collection, photo no. 78.0315, local identifier umt010494. Archival Photographs from the University of Montana, University of Montana Mansfield Library. Montana History Portal. Accessed September 3, 2026.