The book is structured in two parts: Part one deals with the results of air work from the fall of 1935 through the spring of 1936, one more flight in March 1937 to the plain of Gurgan, frequently called the Turkoman plain, and two additional flights to Azerbaijan and to Luristan. Part two documents three exploratory flights in 1937. An archaeological map of the environs of Persepolis was made which shows a decidedly advanced method of plotting. In thirteen hours of flying more than four hundred ancient sites in the plain of Persepolis were mapped.' The books is profusely illustrated with 119 plates of striking aerial sepia toned photographs of ancient sites, many of them with overlays of descriptive drawings relating to the respective photographs. In addition the book is illustrated with archaeological plans and maps.