The Gregg M. Sinclair Papers consists of miscellaneous documents related to the Duluth and North Dakota Railroad Company of Drayton, North Dakota. The documents include correspondence, lists of stockholders, and instructions to agents selling subscriptions for stock. The majority of the materials are undated.
Gregg Sinclair's father, Dr. John Sinclair of St. Thomas, North Dakota, was involved in some capacity with the Duluth and North Dakota Railroad Company.