Production costs have resulted in the hard back binding steadily rising in price and take many books beyond the reach of the majority of readers. This is a book which provides an important and well researched history of photo-reconnaissance by the RAF. It is always a great shame when source books and definitive works are published in soft back because they are often avoided by libraries that should carry them. However, this book benefits from a soft back binding in providing superb value for money. The author demonstrates thorough research into a subject that has received much less coverage than it deserves. There is good use of illustration and a large number of black and white photographs.