BOOK: De La Torre, Gustavo: "Método de Identificación y clasificación de los Rivadavias de 5c.", a great work with many illustrations and a sheet reproducing the 5c. Rivadavias of the different printings, which will allow any collector to unlock the secrets of these stamps
BIBLIOGRAPHY: "La Historia del Correo de España e Hispanoamérica (1500-1820)", written and signed by Walter Bose, with interesting details of these topics
Sheet with advertising impression for the Argentina 85 Stamp Show + sheet with reproduction of HB 45 on back and history of the Society on front, VF group
