His later work, translated and published in France, won the appreciation of André Breton, Paul Valéry, Marcel Griaule, and Jean Cocteau.
[5] With Paul Valéry, he co-wrote Conversation sur l’histoire along with monographs on painters including Henri Rousseau and Giorgio de Chirico.
Lo Duca's novel Journal secret de Napoléon Bonaparte (The Secret Diary of Napoleon Bonaparte), published in 1948 with a preface by Jean Cocteau, received enthusiastic reviews from Georges Bataille, Jacques Audiberti, Joseph Delteil, Marcel Pagnol, Jean Dutourd, and Jacques Chastenet.
In 1951, Lo Duca found a copy of the negative of Carl Theodor Dreyer's second version of The Passion of Joan of Arc in the Gaumont Studios vaults, to which he then made several changes, including the addition of a baroque musical score and the replacing of intertitles with subtitles.
In 2004, he granted his last interview to Canadian filmmaker Damian Pettigrew and talked about the creative relationship between Fellini and his wife Giulietta Masina, as well as Italian writer Mario Tobino's influence on the screenplay of La Dolce Vita.