The collection consists primarily of correspondence (1877-1879) with Angus McDonald concerning the Nez Perce and Flathead tribes. There is also a reminiscence by William H. Todd of their trip to Yellowstone, several letters concerning family and political affairs, and two miscellaneous writings by Knowles. Also certificates of appointment as Associate Justice to the Supreme Courty Montana Territory, U.S. District Judge, Constitutional Convention delegate election, Doctrate of Law from the University of Montana.