Montana: A History of Two Centuries first appeared in 1976 and immediately became the standard work in its field. In this thoroughgoing revision, William L. Lang has joined Michael P. Malone and Richard B. Roeder in carrying forward the narrative to the 1990s. Fully twenty percent of the text is new or revised, incorporating the results of new research and new interpretations dealing with pre-history, Native American studies, ethnic history, women's studies, oral history, and recent political history. In addition, the bibliography has been updated and greatly expanded, new maps have been drawn, and new photographs have been selected.

Describes the geology, mining situation, and types of metallic minerals found in the areas of Valley, Revais, Magpie, Vanderburg, and Seepay creeks, as well as areas such as Glaucus-Cardiff, Hot Springs, Irvine Lookout, Hog Heaven, Jocko River and the Mission Range.