After you exit the Geothermal Valley, climb down, on the left (the screenshot).
Under the bridge, cross the swamp, over to the other side, where you find the document in the recess.
Nearly in a straight line, West of the Remnant Bazaar, at the blue gate.
In the tent opposite the descent into the lower part of the location.
On the table in camp Riverside Landing.
After you leave camp Riverside Landing, on your path towards the tower.
On the table at the wall in Tower Courtyard (in the main storyline, this is where the helicopter is shot down).
In the small corridor to Tower Courtyard towards Catacombs.
Among bushes on the ledge, which you climb onto for the first time, using the rope you got from Sofia.
It is in the box, in the central spot of the same location as Remnants Bazaar, when you visit the location for the second time.
After the fight in this location, return to the big chamber, where you find an opened descent into the catacombs. Jump down and open the gate. The document is right past the gate, at the other side.