Correspondence, reports, and articles discussing the impact of agriculture and reclamation projects on the Lower Klamath, Tule Lake, and Clear Lake Refuges. Topics of focus include the impacts of grazing on bird refuges, construction of dikes and dams on the Klamath and Link Rivers, and possible reflooding of portions of the Lower Klamath Lake.

Documents focus primarily on the destruction of bird nesting sites through the careless practices of the Reclamation Service, including prescribed burning and leasing of land for grazing. Other topics include cooperation between the Reclamation Service and Biological Survey, duck hunting, and recommendations for restoring refuges to ideal nesting conditions. A map of the Klamath Irrigation Project is included.