Kick of Tyr
This Book of Knowledge is found in the enemy camp at Threaded Pass Camp. You’ll need to head into one of the buildings then make your way down into the basement where you’ll find the Book of Knowledge behind a locked door. Use Odin’s Sight to discover the location of the key, which is found atop a tower. You can’t climb up this tower like you would ordinarily as it’s surrounded by spikes. Instead, you’ll need to climb up the tower above it and use the zip wire to zoom down and make an emergency exit off the wire when you reach the tower with the key. Once you have the key you can head into the basement and retrieve the book.
Poisonous Powder Trap
This Book of Knowledge is found at Petuaria Ruins. You’ll need to head down into the basement area via the ladders then head through the gap under the wall where you’ll come to a room with a breakable stone barricade. If you have incendiary powder trap then you can shoot its right at the barricade and avoid all the trouble and head straight into the room with the book of knowledge. If not, then you’ll need to dive into the water and swim up into a new room where you’ll find several oil vases. Use one to explode a second barricade which is blocking a clear pathway to the other stone barricade. Then, carry an oil vase into the original room and use it to explode the barricade. Once that’s done, move the moveable shelf object and throw a torch into the room to dispel the toxic gases before you are then able to pick up the book of knowledge.