The Homer Campbell Papers consist of materials created and assembled by Campbell as an undergraduate student at Oregon State College and in the course of his career as a fisheries biologist, volunteer with the Audubon Society, and environmental activist. The collection includes brochures, correspondence, course materials, curriculum vitae, flyers, legislative bills, maps, meeting minutes, newsletters, newspaper clippings, notes, photographs, and reports.
The bulk of the collection consists of correspondence/subject files for topics, locations, publications, organizations, and events. These files primarily reflect Campbell's advocacy for environmental issues and include letters to elected officials, editorials submitted to newspapers, notes from conferences, and minutes from organizations such as Save Our Stratosphere. Topics addressed include protection of landscapes in Oregon, depletion of the ozone layer, livestock grazing on public lands, preservation of old growth forests, stream restoration, and protection of salmon runs.
Materials from Campbell's student years at Oregon State include notes, class outlines, course readings, and student papers. Courses on the management of game birds, ichthylogy, range and pasture botany, civilian pilot training, and aquatic entomology are represented.
The Audubon Society materials include newsletters and membership lists and document Campbell's involvement in various preservation campaigns, including the addition of the Snag Boat Bend area to the Finley Wildlife Refuge. The photographs consist of 22 prints and 20 negatives and depict a field trip to Hart Mountain and the Corvallis Audubon Society booth at the Benton County Fair.