“A Navajo construction worker at the Navajo Generating Plant. When completed, this will be the largest such plant in Arizona”

By Lyntha Scott Eiler, Page, Arizona, May 1972.

The first hard hats were designed for miners to protect them from falling objects. They were based on World War I military helmets and made of steamed canvas, glue, and black paint.  Later versions were made of aluminum, fiberglass, and plastic.

National Archives, Records of the Environmental Protection Agency (412-DA-1670)