One of those classic products of Judges Guild. For the price, the product is well worth using for the busy GM. Although I own the original, having a printable one is an excellent way to integrate the product into an established game.
This book contains simple outline maps of castles laid over hex maps. This might come in handy every once in a while and for $2, it's certainly priced right, but its usefulness is limited. You certainly don't need both books.