You find it right after you enter the location, by the campfire in the Threshold of Kitezh Base Camp.
In the corner of the destroyed room.
At the foot of the statue, in the middle of stairs to the first gate.
In the recess of the building adjacent to the square. To enter, you need to use explosives to destroy the metal barricade.
Downstairs, at the wall, right after you enter tomb Chamber of Exorcism.
In the hall, right after you enter tomb Chamber of Exorcism, on the balcony to the left of the entrance.
Right after you enter the crypt (it is under the water surface and you need to swim under the building)/ Inside, smash the wall and you find the document there.
On the tall bell tower, climb it starting from the bottom (arrows stuck in the wooden wall).