 It was decorated with original photos shot in Spain by the famous photographer-reporter Robert Capa, notably one where people of Madrid watch smiling as the Republican fighters chase away the Francoist bombers.It also contained a map of Spain where the locations of the landing grounds of Campo Soto and Campo X, used by the Andres Garcia La Calle squadron Tinker flew with, appeared for the first time to the public.It remains unique on the description of a number of other figures of the Lacalle squadron team for whom no other recorded evidence was left
The book has today an historical value and was used as a main reference for studies on the adventure of the Americans who flew with the Spanish Republican Air Force during the civil war.