CDWB00173: Outline Plan for Provision of a DND Emergency Headquarters (19 Jan 1961)
This plan sets out the full plan for a “Tri-Service DND Emergency Headquarters” at the selected site of Camp Petawawa (Later Operation TRIDENT)
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RG25-A-3-b, vol. 6028, file 50285-40, pt 2-2 "Emergency planning by National Defence Headquarters, in Ottawa in event of disaster", Library and Archives Canada.