Governor DeForest Richards - Petition for Pardon D.M. Keller, https://drive.google.com/file/d/0B_YiJoTQNoYeNG5GSDFDQXRsbDA/view?usp=drive_link&resourcekey=0-_9uSsI0kUHz4hDs3CFjh0w. Wyoming State Archives, Wyoming Cultural Resources Division, Wyoming Department of State Parks & Cultural Resources.

Governor DeForest Richards - Petition for Pardon D.M. Keller, https://drive.google.com/file/d/0B_YiJoTQNoYeNG5GSDFDQXRsbDA/view?usp=drive_link&resourcekey=0-_9uSsI0kUHz4hDs3CFjh0w. Wyoming State Archives, Wyoming Cultural Resources Division, Wyoming Department of State Parks & Cultural Resources. https://wyocomet.wyo.gov/repositories/2/digital_objects/734 Accessed November 28, 2024.