German 7.9mm Military Ammunition by Daniel W. Kent 158pp 1st edition. This now out of print book is completely dedicated to the 7.9 (AKA 7.92mm/8mm). This thorough hardback reference first printed in 1973 is now quite hard to find, but is also sought after which is reflected in its price.
Photo shows actual book. Does not seem to have been published with a dust cover. Conditon Very good, some age grubbiness to front cover and the odd mark inside.