By the time picture postcards came into popular use shortly after 1900, Bozeman was almost 40 years old and prospering, and the Gallatin Valley was becoming settled. The region is well documented in the 20th century by postcards, many of which are published here for the first time. Initial chapters include Bozeman's downtown, Sweet Pea Festival parades, the Bozeman Round-Up, the state university, and the town's continuing expansion. The second part looks at the Gallatin Valley, from Three Forks to Belgrade, and south to Gallatin Canyon.