If you're planning a trip overseas anytime soon, you should definitely check out this bookstore. (They're great for domestic, travel, too!)
You will find shelves of nothing but travel books for every country and city you plan to visit. If they don't have it on the shelf, I'm sure they will happily order you a copy.
They also have various travel supplies (chargers, plugs, money pouches, etc.)
Staff is very friendly, and it's a nice break from the big bookstores.
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