This is an original German World War II manual titled Der s.M.G.-Schütze Hilfsbuch (Machine Gunner's Handbook).
Written by Hasso von Wedel and Kurt Einftmann, the book contains instructions for the operation and handling of heavy machine guns such as the MG 34 and MG 08.
It was published by Richard Schröder Verlag in Berlin and served as a practical reference guide for German machine gun crews during the war.
in used but complete condition