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aeronautics-
carlos ródenas ferré
Dr. Ignác Semmelweis 1818-1865.
Herman Cudris Castañeda
First Man on the Moon
Herman Cudris Castañeda
CCCP-Viewaf, North Pole Research Station
Herman Cudris Castañeda
Space science.
Herman Cudris Castañeda
Crhistian F. Schonbein- discoverer of the ozone layer
carlos ródenas ferré
Edifil 1122
Miguel Rodríguez López
Brazil-change
Miguel Angel Sancho
Ecuador-change
Miguel Angel Sancho
Edifil 4953
Miguel Rodríguez López
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2.315 stamps