The collection consists of a report with appendices authored by John Yeon, chair of the Pacific Northwest Regional Planning Commission's Columbia Gorge Committee. In the report, Yeon argues in favor of establishing an interstate park in the Columbia River Gorge on both sides of the river; describes specific areas of the Gorge, such as the Cape Horn area and the Beacon Rock area; and discusses lands that would need to be purchased to establish the park. The appendices, which make up the bulk of the collection, include fold-out maps showing areas of the Gorge, population density in Pacific Northwest, railroad facilities in the region, land ownership in the Gorge, and soil types in the Gorge; a list of currently owned properties in the Gorge; lists of delinquent taxes for properties to be purchased; photographs; and copies of statements and correspondence of officials regarding the proposed purchase of lands for a park.