I have several copies of both stashed all around. There are already certain sections of the PocketRef which could be in an urban survival guide but most of the info would not be helpful.

If such a book existed I would buy one in a heartbeat.

Any pocket reference is nice to have though. You never know when you're going to need it. I needed to buy some bulk Hydrochloric acid once and the PocketRef helped me calculate how much it would weigh!