1. Fort Assinniboine Military Reservation, Montana to be opened to entry under act of February 11, 1915, and September 7, 1916, and president's proclamation dated October 2, 1916. [cartographic material] Yale Public content 1916. 2008-10-21T15:27:57Z. 2011-03-28T23:34:09Z. United States. General Land Office. General Land Office. English. Public. Montana, HIll County, Fort Assinniboine Indian Reservation (Mont.), and Hill County.