H80-16/172 P and R Building Addition Preliminary Plans (Shell Oil Company), Casper, WY, https://drive.google.com/file/d/0BwGs7_2V6bvEdGlLRHk4MDlvXzA/view?usp=drive_link&resourcekey=0-PFHUhisceXmjv1ekktNqxQ. Wyoming State Archives, Wyoming Cultural Resources Division, Wyoming Department of State Parks & Cultural Resources.

H80-16/172 P and R Building Addition Preliminary Plans (Shell Oil Company), Casper, WY, https://drive.google.com/file/d/0BwGs7_2V6bvEdGlLRHk4MDlvXzA/view?usp=drive_link&resourcekey=0-PFHUhisceXmjv1ekktNqxQ. Wyoming State Archives, Wyoming Cultural Resources Division, Wyoming Department of State Parks & Cultural Resources. https://wyocomet.wyo.gov/repositories/2/digital_objects/4472 Accessed November 23, 2024.