I was in Saskatoon in October and the crows I saw were big and raspy and perhaps ravens? I wish I had my calls with me - I was waterfowling. From what I heard, the birds were close in sound from what I hear in Pennsylvania.
As far as finding sounds, you just have test out ones you can find. Of course, finding the MP3s is part of a challenge. Check out Foxpro's sounds and Primos sounds. You should be able to grab some samples and compare for yourself in the field.