In the Arlington Utility tunnels. From Arlington Cemetery north, go up a set of stairs on the left then right at the top. It's on a shelf on the right side of the room.
In the car dealership building to the east, on the upper level where there are smaller, ruined vehicles. You need to jump onto the coffee table in the corner to get to there. Its on a generator.
In Franklin Metro Utility, through an underwater section of the subway tunnels near a lot of radiation. Can also be reached from the subway entrance next to Hubris Comics
In an ammunition container in the burned out bus near the red railroad car. You can get the key from the random encounter "More Than Just Scrap", or you can just pick the lock (hard).
In a room full of weapons on the bottom floor behind a very hard door or a very hard terminal.
Notes[]
It is possible to obtain infinite copies of the book because of a raider in the Bethesda East offices who respawns every 73 "game time" hours. This resets his inventory and the book can be taken from him multiple times.
An image of this book is copied onto a slide for the Vault Dweller's Survival Guide. The slide's identifying number is VDSG Plate #619-58.
It is likely that "recipes" is an analogy to combat tactics involving the flamer, presented in a humorous format of a cookbook.
This is the only skill book that is unique to Fallout 3, as it is not present in earlier games and does not return in Fallout: New Vegas, due to the Big Guns skill being collapsed into Guns and replaced by Survival.