This book about short wave radio propagation is divided into eight chapters: elements of the problem; theory of propagation in a horizontally stratified atmosphere; meteorology of the refraction problem; experimental studies of refraction; reflections from the Earth's surface; radar targets and echoes; meteorological echoes; and atmospheric attenuation. Authors A. M. Stone@ D. E. Kerr@ S. A. Goudsmit and L. B. Linford@