This is the complete illustrated history of Polish aircraft PZL.37 Los. The book covers the development history of this modern and very innovative Polish bomber, its service in Polish units before World War II, The September Campaign in Poland, and the aircraft’s service in German and Russian hands. One of the chapters is devoted to the Los's service in Rumanian air forces, another gives a detailed, illustrated technical description of the aircraft, and one more describes its camouflage schemes. Colour plates and appendices make the book complete - some previously unpublished original documents are reproduced (aircraft provisional manual, reports from tests in Russia, and fragments of the flight book of one of the Polish Los pilots). Lots of unseen photographs are also included in this unique reference guide for historians and modellers alike. About Monografie Lotnicze This series is published in Polish with English photo captions, and presents the most popular, most interesting and the best aircraft design of the 20th century. Every monograph describes particular airplanes in a complex way– it contains a history of its development, its historical background and manufacturing history, combat use, camouflage and markings and a detailed technical description. Complemented by hundreds of historical photographs illustrating the subject, plans in modelling scales, and colour profiles depicting the airframes of different times and units, Monografie Lotnicze are a rich source of knowledge, not only for readers interested in aviation history, but also for modellers.