
the cover of "If We Are Bombed" a government pamphlet from the St. Paul [Minnesota] Civil Defense Organization c.1948-1952.

p.10 of this pamplet relates what to do if caught in the open during an attack.

Did you ever wonder what happens when an atomic bomb explodes? Well, the St. Paul Civil Defense Board wanted you to know!
I love the graphics in this pamplet. These sorts of booklets were published throughout the US in every major city in the 1950s and 1960s. There were very detailed, if untested, plans in place to survive a nuclear attack from the USSR.