http://www.cic.gc.ca/english/information/pr-card/apply-first-pr-card.asp
"Canada’s entry requirements are changing:
Permanent residents (PR) of Canada must carry and present their valid PR card or permanent resident travel document (PRTD) when boarding a flight to Canada, or travelling to Canada on any other commercial carrier. If you do not carry your PR card or PRTD, you may not be able to board your flight, train, bus or boat to Canada.
It is your responsibility to ensure that your PR card is still valid when you return from travel outside Canada, and to apply for a new PR card when your current card expires."
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From outside Canada all you can get is a PRTD (PR Travel Document).
