The book, Aircraft Profile # 233: Kawanishi 4 - Motor Flying-Boats (H6 K 'Mavis' And H8 K 'Emily') is part of a series of Profile Publications centered on chronicling the development and use of ground-breaking or interesting aircraft during the 20th century.  "Aircraft Profile # 233: Kawanishi 4 - Motor Flying-Boats (H6 K 'Mavis' And H8 K 'Emily')" tells the interesting story of the development and use of two of Imperial Japan's largest and most successful flying-boats used during World War II.  By late 1942, the fortunes of war had begun to turn against Imperial Japan.  An important factor contributing to this reversal was the increasing losses suffered by the Imperial Japanese Navy and Army Air Forces.  Aside from losing aircraft that were difficult to replace, Imperial Japan was losing irreplaceable aircrew due in large part to the early war aircraft design philosophy of Japanese aircraft manufacturers.  Early on in the war the major motivating factor in aircraft design was superior performance.  Many early Japanese aircraft types achieved better performance by building aircraft with lighter materials and by avoiding safety measures like armor plating and self-sealing fuel tanks.  An aircraft example that followed this design mindset was the Kawanishi four-engine H6 K Flying-Boat.  While relatively easy to fly and fairly dependable, they were easy marks for roving American fighters.  As the war progressed the Japanese aircraft industry began to realize that Japan needed aircraft designs capable of withstanding and initial attack run by an American fighter.  This updated thinking materialized in the subsequent development of the Kawanishi four-engine H8 K Flying-Boat that was both more powerful and safer to fly.  The H8 K incorporated armor plate, self-sealing fuel tanks and a fuel system that utilized fire extinguishers but was still capable of a relatively high speed and long endurance.  Unlike the Kawanishi H6 K Flying-Boat, the H8 K was seldom an easy 'kill".   The major sections of "Aircraft Profile # 233: Kawanishi 4 - Motor Flying-Boats (H6 K 'Mavis' And H8K 'Emily')" are as follows: 1) Introduction; 2) Kawanishi Development: H6 K And H8 K; 3) Operational Records Of The H6 K And H8 K Series; 4) Kamikazes And The H8 Ks; 5) Operational Record: Transport Versions Of The H6 K And H8 K Series; 6) Postscript and 7) Principal H6 K And H8 K Units Of The IJNAF.  In addition to an informative narrative, "Aircraft Profile # 233: Kawanishi 4 - Motor Flying-Boats (H6 K 'Mavis' And H8K 'Emily')" includes the following features: 1) 36 vintage black and white photographs; 2) 5 color side aircraft profiles; 4) 1 two-view color Kawanishi H6 K5 Navy Type 97 Flying-Boat illustration of an aircraft operated by the Yokohama Naval Air Corps, Imperial Japanese Navy Air Force, Late 1942 and 5) 1 Five-view color Kawanishi H8 K2 Navy Type 2 Flying-Boat, Model 2-2 (Emily) illustration of an aircraft operated by the 801st Naval Air Corps, Imperial Japanese Navy Air Force, Late 1944.  This book is sure to appeal to both aviation enthusiasts and modelers alike. This book is 23 pages and is in excellent condition.  The author is M.C. Richards.  Edition published in January 1971.