I've got a third-party Arduino Uno R3 kit, which unfortunately doesn't include the Arduino Project Book from the (continually out of stock) official Arduino Starter Kit. Is there any way to get a PDF of this book, or order a hard copy individually?
This isn't the official Arduino project book, but it's good to get going with.
http://www.earthshineelectronics.com/files/ASKManualRev5.pdf
At the moment, http://store.arduino.cc/ is "down for maintenance" until the 6th. I would be surprised if the book wasn't available there.
The kit from Earthshine Electronics is way better and always in stock.
https://www.earthshineelectronics.com/
A lot of Arduino books are available for a Kindle, if you haven't got one you can get a free reader app for your chosen platform.