The value of this book depends on what you'd like to get out of it. There are some photos in the beginning of the book, but the majority of it contains a series of line drawings of various parts of the Type VII.
This is a good book, but if I were to rank the value of book on the Type VII, I would put the "Vom Original Zum Modell: Uboottyp VII C" by Fritz Kohl at the top of the list for model builders.
I agree with Antoine's 2nd book request, but please make sure that you get Stern's book titled The Type VIIC U-boat and not the Squadron Publication titled U-boats in Action.
On an even par with Stern's book would also be David Miller's book titled U-boats: The Illustrated History of the Raiders of the Deep. Here's the link to Amazon.com - Miller's U-boat book.
Miller's book is in some ways better than Stern's book, but both are definitley books to acquire if you are looking for some very good explanantions of how the various parts of a U-boat works, strategy, tactics, and history of the German Ubootwaffe.
One think about the Anatomy of the ship book is that it shows the Type VIIB having two air intakes ducts in the sail (one at each side). I know that this was discussed before but: How correct or incorrect is this?
...depends on which Type VIIB you might be talking about.....
When the Kriegsmarine began to run their Type VII and VIIB boats out into the North Atlantic, it was quickly discovered that the as-built location for the diesel air intakes (located beneath the aft conning tower deck), was not high enough. Too much water would get ingested.
A number of air intake 'designs' were tried on most of the VIIBs to determine what would work best. The end result was the two stack design seen in the Type VIIC series....though where the actual intakes were varied between the upper, rear sides of the tower and the top of the stack itself.
So, if you are building a specific numbered hull, you need to figure out how it's air intakes were arranged.
p.s. If memory serves, I do not remember seeing many photos where we could absolutely determine that the VIIB in question had two external stacks...but yes, it did happen.