This collection contains correspondence, photographs, documents, and other materials pertaining to the desert ecologist Edmund C. Jaeger. Included is correspondence regarding Jaeger's research in the desert, photographs of plant and animal species and desert palavers, reports on ecological findings, and more.

The Frank C. Vasek papers contain articles, reports, correspondence, photographs, and other material from Vasek's tenure as life sciences professor at the University of California, Riverside. The bulk of the collection consists of information on plants from California and other areas.