Only one raven in Canada, Corvus corax principalis, the 'common' raven or Le Grand Corbeau.
Holarctic (Both old and new worlds)

The Birds of Canada, W. E. Godfrey, National Museum of Natural Sciences, National Museums of Canada.

I had to look it up, since I wasn't sure there was only one.

This large size book has excellent pictures, and good, detailed descriptions. Look for used copies.