The Donald B. Zobel Papers reflect Zobel's involvement with the Oregon Flora Project. The Papers includes correspondence, grant proposals, meeting minutes and agendas, publications and research notes documenting Zobel's work on the Oregon Plant Atlas component of the Flora Project. The collection also includes issues of the Oregon Flora Newsletter.
An addition to the collection (Accession 2014:043) is made up of materials collected by Botany and Plant Pathology professor Zobel which include reports and an undergraduate thesis. Some of the reports relate to research on Port Orford cedars by the U.S. Forest Service from 1935 to 1952. These reports include correspondence referencing the Port Orford studies. In a note attached to these documents, Zobel cites his own studies on Port Orford cedar. Other reports in this transfer pertain to remnant natural areas in Benton County and the Regional Forest Nutrition Research Project. None of these reports were authored by Zobel. The thesis was written by Amanda Parry at the University of Lancaster (UK) and is entitled: "A Study of Forest Regeneration in McDonald Forest."