Governor Joseph M Carey – Petitions for Pardon, Grippen, Charles A., https://drive.google.com/file/d/0B_YiJoTQNoYeSkpZSXJKQnRyYzg/view?usp=drive_link&resourcekey=0-9uU4SaMR63NYq-mx6m2j0w. Wyoming State Archives, Wyoming Cultural Resources Division, Wyoming Department of State Parks & Cultural Resources.

Governor Joseph M Carey – Petitions for Pardon, Grippen, Charles A., https://drive.google.com/file/d/0B_YiJoTQNoYeSkpZSXJKQnRyYzg/view?usp=drive_link&resourcekey=0-9uU4SaMR63NYq-mx6m2j0w. Wyoming State Archives, Wyoming Cultural Resources Division, Wyoming Department of State Parks & Cultural Resources. https://wyocomet.wyo.gov/repositories/2/digital_objects/4738 Accessed November 14, 2024.