New +3 Knowledge Treasures for Crafting professions are all located in Zaralek Cavern. Like all Knowledge Treasures, you must have at skill of at least 25 in the profession to interact with them. Credit and sincere thanks to Blazeton from /r/woweconomy subreddit for their locations! These are all now included in the Knowledge Point guide:
Earning Knowledge Points
All Crafting professions except Engineering have three new items for a total of +9 Knowledge points.
