Just Horse posted a video where he counted 19 from the Unnamed City, plus one more for the Improved Climbing Gear recipe. I currently have all of them but the Venom Infused Daggers and War Axe.
EDIT - While doing research for another thread in SP, I can confirm the 19 recipes. If you’d like to see them for yourself, open the Admin Panel, toggle it to Miscallenous or whatever and search for Scrolls.