Corrugated Steel Fallout Shelter Protects Against Most Mild Rainstorms, Probably

This fallout shelter plan, from 1962, only cost $150 in raw materials, and if properly made, had a “protection factor greater than 500.” 500 what? No idea! [Mayor’s Office via Boing Boing]

Corrugated Steel Fallout Shelter Protects Against Most Mild Rainstorms, Probably

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Corrugated Steel Fallout Shelter Protects Against Most Mild Rainstorms, Probably

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