The Martha Edgerton Rolfe Plassmann Papers consist almost exclusively of the writings of Mrs. Plassmann. There are, however, also typescript copies of letters from Mary Edgerton to Martha (1863-1865); incoming and outgoing letters of reminiscence and historical research; and correspondence reflecting Mrs. Plassmann's interest in the welfare of Montana's Indian population. There are also typescript copies of letters (1863) from Mrs. Sidney Edgerton to her mother. There are manuscripts of two major works. The first of these is an autobiography ("Judge Edgerton's Daughter") which includes a detailed description of her trip across the Great Plains in 1863 by ox team. The second ("Lost with Lewis and Clark: A Mystery Solved") is a study of the exact route of the Lewis and Clark Expedition on September 4-5, 1805, in the region of present-day Gibbon Pass. In addition there are a total of over 500 articles on a wide variety of topics. The largest percentage deal with trappers, explorers, pioneers, and vigilantes.