The book "The device and principle of operation of the hydromechanical gearbox of the bus LiAZ-677" by A. P. Panycheva is a unique work that immerses the reader in the world of automotive technology, revealing all the subtleties and nuances of the work of one of the most famous buses of the Soviet era. This work will be a real find for anyone interested in the automotive industry, mechanics and the history of vehicles. LiAZ-677 is not just a bus, but a symbol of an entire era, which for many years served on urban routes, providing comfort and mobility for millions of passengers. In the book, Panychev examines in detail the hydromechanical transmission, which is a key element in the transmission system of this bus. The author not only describes the device of the box, but also explains the principle of its operation, which allows the reader to better understand the mechanical processes occurring in this complex unit. The book will be interesting not only for students of technical universities and specialists in the field of motor transport, but also for everyone who is fond of the history of technology, as well as for those who want to independently understand the device of their car. Panychev uses accessible language and illustrative examples, which makes the material understandable even for those who do not have a special education. The topics raised in the book cover a wide range of issues: from the basics of hydraulics to the principles of transmissions. The author shares his knowledge on how to properly maintain and repair the gearbox, which can be especially useful for motorists and mechanics. It also touches on the reliability and durability of this system, allowing the reader to appreciate the importance of proper car care. Style A. P. It is very clear and structured.. He skillfully combines theoretical aspects with practical recommendations, which makes the book not only informative, but also practical. Panychev is the author of other well-known works on various aspects of automotive engineering, and his experience in this area allows him to share valuable knowledge that will be useful for both beginners and experienced specialists. This book is not just a textbook, but a real encyclopedia for anyone who wants to understand how a hydromechanical gearbox works and what factors affect its effectiveness. Readers interested in the topics of automotive industry, mechanics, as well as the history of the Soviet automotive industry, will find in it a lot of useful information and interesting facts. In conclusion, "The device and principle of operation of the hydromechanical gearbox of the bus LiAZ-677" is a book that deserves the attention of not only professionals, but also fans of technology. It will help you not only to understand the complex mechanisms, but also to appreciate the era when the buses LiAZ-677 were real heroes of city streets. If you are looking for a quality and fascinating reading on the topic of automotive technology, this book will be an excellent choice.