The book, An Illustrated Guide To Military Helicopters is a fact-filled pictorial study of 51 different helicopter models.  This book is a magnificently illustrated directory of the world's most relevant military helicopters from models used at the tail end of World War II up through the early 1980s.  Each of the covered military helicopters includes one or more illustrations and photographs along with the following specifications: 1) Origin; 2) Type; 3) Engines; 4) Dimensions; 5) Weights; 6) Performance; 7) Armament; 8) History; 9) Users and 10) Development.  The military helicopters reviewed are as follows: 1) Aerospatiale Alouette; 2) Aerospatiale Super Frelon; 3) Aerospatiale Dauphine; 4) Aerospatiale/Westland Gazelle; 5) Aerospatiale/Westland Puma and Super Puma; 6) Agusta A 109; 7) Agusta A 129 Mangusta; 8) Bell 47; 9) Bell "Huey" family; 10) Bell 206 Kiowa and JetRanger; 11) Bell 209; 12) Boeing Vertol H-46 family; 13) Boeing Vertol CH-47 Chinook; 14) Bristol (later Westland Sycamore; 15) EHI EH-101; 16) Flettner FI 282 Kolibri; 17) Focke Achgelis Fa 223 Drache; 18) Hiller UH-12 Raven; 19) Hughes TH-55 Osage; 20) Hughes OH-6 Cayuse and 500 M; 21) Hughes AH-64; 22) Kaman H-43 Huskie; 23) Kaman SH-2 Seasprite; 24) Kamov Ka-25; 25) MBB BO 105; 26) Mil Mi-1; 27) Mil (WSK-Swidnik) Mi-2; 28) Mil Mi-4; 29) Mil Mi-6 and Mi-10; 30) Mil Mi-8; 31) Mil Mi-14; 32) Mil Mi-24; 33) Saro Sketer; 34) Sikorsky R-4; 35) Sikorsky S-51; 36) Sikorsky S-55; 37) Sikorsky S-56; 38) Sikorsky S-58; 39) Sikorsky S-61; 40) Sikorsky S-64; 41) Sikorsky S-65; 42) Sikorsky S-70; 43) Vertol H-21; 44) Vertol HUP/H-25; 45) Westland (Bristol) Belvedere; 46) Westland Wessex; 47) Westland Scout and Wasp; 48) Westland Sea King and Commando; 49) Westland/Aerospatiale Lynx; 50) Westland WG.30 and 51) Yakovlev Yak-24.  In addition to an informative narrative, this book includes the following features: 1) 100 action photographs most in color; 2) 21 detailed color profiles and 51 three-view drawings.  This book is 160 pages and is in excellent condition.  The author is Bill Gunston.  Edition published in 1981.