Stevens, Joseph E. Hoover Dam: An American Adventure. Norman and London: University of Oklahoma Press, 1988.
Refer to Sean's research question to determine which of the following topics would be the BEST additional main idea.
a. how the Hoover Dam was named by government leaders
b. explanation of the job of "highscalers," who worked suspended from high canyon walls
C. the political process of getting the dam project approved and funded
d. the artworks that enhance the appearance of the dam and the visitors' center