Although covering the same subject as Warrior 74: Gebirgsjager, German Mountain Trooper 1939-45, I found this Elite volume to be somewhat more focused and less repetitive, although both volumes are neccessarily brief.
Elite, extremely fit, and highly motivated but lightly equipped infantry troops mostly from Southern Germany and Austria Gebirgsjager fought in all theatres of World War 2, proving extremely effective in Norway and Greece until their eventual stop-gap employment and destruction in the Western Front.
This volume covers the main Gebirgs divisions and corps, the SS and ethnic Gebirgs formations, major campaigns, decorations and insignia, uniforms, and has the usual excellent Osprey color plates and period illustrations. However weapons, tactics, and general unit structure are not covered to a great extent, my only complaint about this otherwise excellent general reference.
Both Osprey volumes mentioned make good companions to;
Seven Days in January; With the 6th SS-Mountain Division in Operation Nordwind, 0-9666389-5-6