Case, W.C.. 1949. "Flow Characteristics of a Challenger 4-inch Fluid Meter, March 30, 1949 (For U.S. Government use only)". Bureau of Reclamation, Report Number HYD-259.
Abstract:
Web Link:
http://www.usbr.gov/pmts/hydraulics_lab/pubs/HYD/HYD-259.pdf
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