Book collection named after U of I Regent Jerome J. Day, whose donated collection of western Americana was the basis for creating this collection.

Research materials, publications, CDs, DVDs, and other papers.

Topographic and Geographic maps, tourist maps, personal records, manuscripts, research materials, drafts of articles, miscellaneous correspondence, Ralph R. Space publications, telephone directory, newspaper articles and corresponding notes.

The Sierra Club is the oldest, largest, and most influential grassroots environmental organization in the United States and the Northern Rockies Chapter of the Sierra Club is concerned with issues involving all of Idaho and eastern Washington. This collection contains organizational records.

The collection includes original academic papers and journals, partial and complete diaries, maps, magazines and handwritten notes.

Aerial photographs prints and negatives of Idaho, Washington, and Montana National forests originally taken in 1933-1936 for the U.S. Forest Service.