jholp--I usually place varmint and predator hunting information on the Small Caliber Discussion Board at this Website.
To answer your query, I'd suggest you contact the game & fish departments in the states you list. You can also contact Chambers of Commerce in cities near prairie dog habitation. One in ND, is the Dickinson Convention and Visitor's Bureau in North Dakota. They used to have information you could obtain from them.
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Catch ya L8R--Silverfox 
NRA Life Member
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