“The book is much more than a collection of papers; however, it represents the most comprehensive volume on the topic and is beautifully illustrated in colour and very carefully edited to provide the reader with a full understanding of the reasons behind the fortifications, and the thinking behind their construction … . This book … is well produced, beautifully illustrated and carefully put together. If you have any interest in the topic at all, then this is a book for you.” (Peter Doyle, Geology Today, Vol. 37 (2), March-April, 2021)“The book is lavishly and beautifully illustrated with photographs of the fortifications, original drawings and sketch maps of the military works and historical military geology maps. Many examples of the German fortifications, particularly tunnels and observation posts, survive in the landscape today and some have been adapted for modern use, such as museums.” (Judy Ehlen, Geoscientist, geolsoc.org.uk, 2020)