This is the best tourist map of Chiang Mai and I recommend this above any other map or guidebook. It is especially good if you want to SHOP!.
It is available from major bookstores in Bangkok. If you want to buy it before you leave it might be difficult to find. The only place I have found is www.tripneeds.com. They seem to have other maps of Thailand as well.

www.tripneeds.com/

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