The most extensive series in the collection are the Visual Materials which is organized by format and includes subseries for Negatives, Photographs, Scrapbooks and Albums, Slides, Stereographs, and Indicies. In most instances, the materials are arranged by geographic regions, states and cities; cultural landscape phenomena like population density and transportation infrasctructure; and natural phenomena like earthquakes, wind erosion, etc.

The most extensive series in the collection are the Visual Materials which is organized by format and includes subseries for Negatives, Photographs, Scrapbooks and Albums, Slides, Stereographs, and Indicies. In most instances, the materials are arranged by geographic regions, states and cities; cultural landscape phenomena like population density and transportation infrasctructure; and natural phenomena like earthquakes, wind erosion, etc.