University of Basel (1934-41)
Centro geominerario, Instituto della Recostruzione Industriale, Napoli (1941-44)
Centro Geologico Silano, Conzilio Nazionale delle Ricerche, Napoli (1944-48)
University of Alexandria (1949-53)
University of Cairo (1953-57)
Volcanology Institute, University of Catania (1958-63)
Istituto Internazionale di Vulcanologia, Catania (1960-68)
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