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Engineers can switch between Goblin and Gnomish engineering for 100 gold. They must go to Steamwheedle Port, Tanaris (on the eastern coast, north side of the zone.) Just north of that town, there is an small house with a book in it that you must interact with. After this step, you must use the book again to select your new specialization. It is reported that some players must do the quests for their new specialization instead of choosing from the book.
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