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United States. Department of the Interior. Office of Library Services: Dictionary catalog of the Departmental Library. Supplement (G.K. Hall & Co., 1968) (page images at HathiTrust) United States. Department of the Interior. Office of Library Services: EARL ([U.S. Dept. of the Interior, Office of Library Services, etc.], 1969), also by United States. Department of the Interior. Natural Resources Library and United States National Park Service (page images at HathiTrust) United States. Department of the Interior. Office of Library Services: Electrofishing for population sampling : a selected bibliography (United States Government Printing Office, 1974), also by Ruth Friedman (page images at HathiTrust) United States. Department of the Interior. Office of Library Services: Proceedings of the Departmental Library Workshop. (Washington, 1969) (page images at HathiTrust)