Simmons, W.P.. 1949. "Erosion Tests on Earth Samples No. 14G-571,658 and 661 Representing Various Strata Through Which the Proposed Unlined Emergency Spillway Channel Will Pass; Cannonball Damsite; Elgin Axis; MRBP; December 7, 1949". Bureau of Reclamation, Report Number HYD-266.
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