File #60: "Figure 3"
Title
Figure 3
Subject
This figure demonstrates the contrast of design between the U.S. Department of Civil Defense symbol for fallout shelter and the predating radiation warning symbol.
Source
Frame , P. "Radiation Warning Symbol (Trefoil)." Origin of the Radiation Warning Sign (Trefoil). Accessed November 07, 2017. http://www.orau.org/ptp/articlesstories/radwarnsymbstory.htm.