Pennsylvania | University of Pennsylvania | United States Department of Defense | United States Department of State | United States Department of Justice | United States Department of Agriculture | United States Department of Energy | United States Department of War | Pennsylvania State University | Pennsylvania Railroad | Harrisburg, Pennsylvania | United States Department of Veterans Affairs | United States Department of the Treasury | War Department | Pennsylvania House of Representatives | Erie, Pennsylvania | Los Angeles Police Department | Carlisle, Pennsylvania | United States Department of Transportation | Beni Department | Department of Energy | Williamsport, Pennsylvania | United States Department of Labor | Scranton, Pennsylvania | West Chester, Pennsylvania | Montgomery County, Pennsylvania | Cochabamba Department | United States Department of Health and Human Services | Lancaster, Pennsylvania | Bethlehem, Pennsylvania |
A system of roadside signage developed by the Pennsylvania Department of Highways just after the First World War, the iconic Keystone Markers could be found at the entrance to every Pennsylvania town, borough and city.