Archival photo showing a model of a mushroom cloud detonating in Cold War-era Ottawa

Seen on the Canadian Civil Defence Museum Association web site : “Ottawa Atom Mushroom Cloud Model Used in Canadian Civil Defence Course”.  Yikes.

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](http://ottawastart.com/wp-content/uploads/2014/04/Ottawa-Ground-Zero-web.jpg)

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(Thanks @koolie62 for the tip!)

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** ** See also: ** Ottawa History Guide

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