Du Pont, Pierre S. (Pierre Samuel), 1870-1954 (collector), Mason, John, 1766-1849 (correspondent), United States. Indian Trade Department (correspondent)
Mason provides shipping and packing directions for gunpowder to be delivered to U.S. Indian Factories at Chicago, Sandusky, Fort Wayne, and Mackinac. He directs the company to ship the gunpowder to Joseph Lopes Dias, agent for the Indian Trade in New York.
On verso: 'Illinois Central depot is located at the south end of Grant Park, near the junction of Michigan Avenue and 12th Street. It is a scene of great activity, and hundreds of trains (suburban and inter-state) pass through its train sheds every day.'