If a person is in process of receiving GC, and he is currently in posession of I512 card (combo advanced parole and work authorization).
Does this person fit into:
persons lawfully admitted to the United States for permanent residence
who are in possession of their alien registration card (Green card) or
can provide other evidence of permanent residence;

ie, can travel without visa to canada? Ive tried to call multiple consulates in US - none of them answer phones for visa questions. Email'ed them as well - got back vague answers...

I guess there are two places the trip may come to stop - airline desk if they decide i512 is not sufficient proof for entrance to canada, and then border patrol...

anyone had experience or thoughts about this?

thanks!