It's a very detailed book on various projects that never made it off the drawing board for one reason or another. If you are into that kind of stuff, which I am, the book is worth getting. Not many books cover this material in detail. With some Internet searching, you might be able to locate a copy for less money. Anyway, the book is very thorough, though the arrangement can make specific models difficult to locate, such as the huge Saunders-Roe flying boat projects, which are in the back of the book. It's an excellent resource and worth a splurge.
The aeroplane has unveiled for us the true face of the earth. -Antoine de Saint-Exupery