The papers of Harry Caldwell span the years 1941 to 1990, with the bulk of the material covering the years 1950 to 1985.

Included are materials reflecting his involvement with University of Idaho committees and the Geography Department, professional research and consulting activities, personal material including his work with Shhh, an organization for the hearing impaired, and a folder documenting the development of his cancer. The final series contains slides taken on trips throughout the Northwest and around the world.