From there he wrote the columns for which he was famous, writing for publications such as the Clarín newspaper or Autoclub, the journal of the Argentine Automobile Club.
[1] Estol's 1946 book on the Argentine boxer Luis Ángel Firpo was the subject of the 1949 movie Diez segundos (Ten Seconds), directed by Alejandro Wehner.
[2] The climax comes with the fight in New York on 14 September 1923 between Firpo, called "The Wild Bull of the Pampas", with Jack Dempsey.
[5] In July 1945 Estol was acting as the New York representative of the Argentine boxer Abel Cestac, whom Dempsey and Firpo had agreed to jointly manage.
[6] From the mid-1950s Estol began to regularly write articles about the US space program, with abundant drawings and photos of the first rockets.