After completing private studies at the Marian sanctuary at Ortonovo La Spezia in 1929 he transferred to the Curia Generalizia and International College of the Stigmatine Order at the convent of Sant'Agata dei Goti on via Mazzarino in Rome in order to begin his philosophy studies at the "Collegio Sant’Apolinare", the future Lateran University.
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For the period of summer-fall 1935 Fabro was on scholarship at the «Stazione Zoologica» of Naples.