This professional-level textbook, 'Principles of Helicopter Aerodynamics' by J. Gordon Leishman, is an essential resource for advanced undergraduate and graduate students, as well as practicing engineers and researchers in the field of aerospace. Published by Cambridge University Press as part of the Cambridge Aerospace Series, this comprehensive volume provides a thorough and up-to-date treatment of helicopter aerodynamics. The book covers fundamental principles, advanced topics, and includes a full bibliography and homework problems, making it ideal for both study and professional reference. The book is in good condition, showing some signs of wear consistent with its age and use.