Next thing to research is: Plateaus Crafter's Primer Volume I Raj'Dur Plateau Plateaus Crafter's Primer Volume II Badlands Plateaus Crafter's Plrimer Volume III Delta These are sold by the guild recipe vendor as soon as you finish the TS line. Probably should be other books.. The Advanced Hizite Crafter's Volume I, II, and III on the same researchers might be a mistake as well as you can get those from the missions. Not sure if that's intended or not but its also several items down the list.
This is fixed. The researchers quietly zipped past the books in question. Now just need to remind people not to buy them with currency.