• 104. Water stage recording instruments 

        Creator(s):Parshall, Ralph L. (Ralph Leroy), 1881-1959, author; Keller, O. B., author; Kelsey, J. B., author
        Date:1921-1922
        Format:correspondence; financial records; bulletins; brochures; blueprints (reprographic copies)
        Correspondence, receipts, and brochures for water-level recording instruments with which the Irrigation Investigations Unit conducted comparative tests. Companies include W. & L.E. Gurley, Keuffel & Esser Co., Leupold, ...