This collection consists of materials accumulated by Hans L. Bille during his tenure as Montana's surface water rights coordinator. Subject files (1938, 1962-1968, undated) relate to the Flathead Irrigation Project, the "Fort Belknap Indian Irrigation District", and the Tongue River Project. Miscellany (1955, 1971, undated) consists of a U.S. Bureau of Reclamation annual project report history for the Milk River Project, and various documents relating to Montana water law and rights.