try a search for "boulder dam" AND people with dates limited to 1931-1936. (Dam changed name in 1947; UNLV uses Hoover Dam consistently but other places may use the labels on old photos that say Boulder)
1850-1950
Primary sources like catalogs, price lists, and brochures reflecting the history of consumer advertising and marketing and life and leisure in America. Includes department store catalogs, cosmetic advertisements, real estate brochures and much more.
1841-2000 with some more recent
Search all ProQuest U.S. historical newspaper collections simultaneously.
ProQuest Historical Newspapers: Chicago Defender (1909 - 1975)
ProQuest Historical Newspapers: Chicago Tribune (1849 - 1993)
ProQuest Historical Newspapers: The Christian Science Monitor (1908 - 2003)
ProQuest Historical Newspapers: Los Angeles Times (1881 - 1993)
ProQuest Historical Newspapers: The New York Times (1851 - 2013)
ProQuest Historical Newspapers: New York Tribune (1841 - 1922)
ProQuest Historical Newspapers: The Washington Post (1877 - 2000)
ProQuest Historical Newspapers: U.S. West, including Reno Gazette-Journal (1876-2008), San Francisco Examiner (1889-2007), and Spokane Statesman-Review (1894-2009)
1887-2005
North American women's magazines including Better Homes and Gardens, Chatelaine, Good Housekeeping, Ladies' Home Journal, Parents Magazine, Seventeen, Cosmopolitan and Essence.
Millions of news and editorial photographs and other images dating from 1750 to the present. Includes many iconic images, but most were never published.
The Digital Public Library of America brings together the riches of America’s libraries, archives, and museums, and makes them freely available to the world.
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Handbook of Material Culture by 
