The McDonald Forest and Peavy Arboretum Maps consist primarily of detailed maps of the Arboretum and Forest prepared from the mid-1930s through early 1940s. The maps document topography, forest site and timber types, and plantings in the Arboretum. Peavy Arboretum and McDonald Forest were established in the 1920s as a teaching laboratory and experimental forest for the forestry students at Oregon State College.
The Donald B. Zobel Collection of Historic Forestry and Vegetations Maps consist of maps assembled and created by Zobel for his research in forest ecology and for teaching; the bulk of the maps depict forests in Oregon and northern California. Zobel was a faculty member in the Oregon State University Department of Botany and Plant Pathology from 1968 until 2003.