2022-03-292022-03-291966https://hdl.handle.net/2152.3/11393First-day cover featuring Leonardo Da Vinci, Italio Balbo, a satellite launching from Wallops Island, and a double floating platform to be used for launches from Paraguay on July 11, 1966.Frist-day cover with eight stamps.Stamp collectingPostage-stamp albumsLeonardo, da Vinci, 1452-1519ParaguayBalbo, ItalioSatelliteLaunching