Hi Diane,
I sent you a PM re. your questions.
According to me there was never a book written about the 86th but there exists one about the 85th Bridge Coy (very hard to get hold of). There is a brief mention on the Canadian Bridge Coys in 'Wait for the Waggon', a book about the history of the RCASC. I have a copy so can provide some scans if you want.
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