Representative Phil D. Swing and U.S. Senator Hiram Johnson, authors of the Swing-Johnson Bill for the building of Hoover Dam. The two legislators are holding a map marked "Boulder Canyon Dam". Johnson had previously been governor of California.
Johnson, Hiram,--1866-1945 Swing, Philip David,--1884-1963 Water-supply--California, Southern Dams--Design and construction Water--Law and legislation--United States Legislators--United States Hoover Dam (Ariz. and Nev.)
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