According to Tin Lids, Canada did manufacture some shells during the 1960's. They were identical to the US manufactured ones and had no distinguishing markings on them. In addition the vast majority of the Canadian production was sent to the US.
Liners for the helmets were procured from the States.
You still can't go wrong getting books!! If you get one M1 now in about a year you could have a dozen of all sorts in addition to the MkII's, MkIII's etc etc. I have 4 or 5 books on helmets and they are not my main collection. Happy collecting.