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Hanson, O.S.. 1939. "Study of the Torque Developed by a 4-inch Plug Valve at Partial Openings; Hoover Dam Turbine Relief Valve; Boulder Canyon Project; October 10, 1939". Bureau of Reclamation, Report Number HYD-67.


Web Link: http://www.usbr.gov/pmts/hydraulics_lab/pubs/HYD/HYD-67.pdf

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