The James E. Oldfield Papers document Oldfield's research and professional activities in animal nutrition and consist of materials created and assembled by Oldfield. The Papers include an appointment calendar, article reprints, books, compact discs, certificates, correspondence, course materials, a guestbook, meeting minutes, newspaper clippings, photographs, plaques, a poster, reports, and speeches. Materials pertaining to Oldfield's research on the protective effects of selenium in eliminating white muscle disease and his mink nutrition studies include articles, books, reports, conference proceedings, Agricultural Experiment Station reports, publications, and speeches. The collection also documents Oldfield's extensive involvement in professional organizations including the Selenium Tellurium Development Association (STDA), Fur Commission USA, and Mink Farmers Research Foundation. Materials reflecting Oldfield's participation in the E. R. Jackman Foundation, the Oregon State University Honorary Doctorate Committee, and the Nutrition Research Institute (where he served as Director) are also part of the collection.
The collection includes about 400 photographs (166 prints, 95 negatives, 112 slides, and 27 lantern slides). The images primarily pertain to selenium and mink research projects; many of the images were used in presentations and articles. Other images document a student exchange program between OSU and Lincoln University (New Zealand).