Saskatchewan Freshwater Fishes - Waterproof Guide
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This is a great little guide. It's small, waterproof, and informative. Great as a quick reference to throw in your tackle box or on your boat. Written by the University of Regina's own Dr. Christopher Somers. I've enjoyed mine and highly recommend.
For a more in-depth guide with longer descriptions, distribution info, and more checkout: Ken Schultz's Guide to Freshwater Fishes.