Quite the cross section of stuff. I see L19 Cessna no702, a M101 4/3 ton trailer, and some commercial panel trucks that appear to be of slightly earlier vintage than those two.
The history on 702 shows one entry that may date the photo:
Quote:
To Central Experimental and Proving Establishment at RCAF Station Namao, Alberta from 24 July 1957, for cold weather trials.
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That would fit in with the timeline on the M101 trailers. The cargo truck in the background looks like a M135.