The series is primarily comprised of photographs (positives and negatives) taken by Andrew St. George, as he tracked the progress of the Cuban Revolution from 1957 to 1960. Arranged in book number order (the numbers were assigned by the creator), there are approximately 750 contact sheets, each with multiple images, that document the 26th of July Movement from the Sierra Maestra mountains in 1957 to Havana in 1959 and Fidel Castro's first year as prime minister. There are extensive and detailed descriptions of each of the contact sheets written by Yale University Assistant Professor of History Lillian Guerra.