50% chance of appearing on the ground in the area behind the green door instead of in the Straight Alleyway. This area becomes accessible after meeting Nicholai at the Cable Car.
In the arm of the statue of Michael Warren in the area behind the green door. This area becomes available after meeting Nicholai for the first time. To acquire the book you need to press the button on the base of the statue to release it.
They appear after re-entering this area after the zombies have already emerged from the green door. They burst through the barricaded windows of the south west portion of the street.
In the hidden compartment of the statue of Michael Warren in the area behind the green door. Place the Future Compass in the statue's arm to reveal it.
Appears in the northern portion of the street after acquiring all the items to repair the cable car, namely the Power Cable, the Machine Oil, the Oil Additive, and the Fuse.