My friend & I were wondering the same thing. Use the internet, the Yahoo search engine (I hate Yahoo but it worked this time) and type in duck calling. Web sites come up with actual ducks calling - they are mostly for educational sites but they are helpful.
To really learn the art of calling I would go out for a couple of days with an experienced guide. Tell him before you hire him that you want to learn how to call. More important than how is when to call, and when NOT to call. You can only learn the situational stuff in the field.
Anyone can blow a decent call with practice. Its the WHEN that matters.
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