
1969 History of Discovery and Conquest of America - Chile
1969 The 15th Colloquium Spectroscopicum Internationale
1969 The 6th Congress of Federation of European Biochemical Societies
1968 History of Discovery and Conquest of America
1967 The 20th Anniversary of the Canonization of Jose de Calasanz
1967 International Congress of Radiology, Barcelona
1966 The 6th World Forestry Congress - Madrid, Spain