To all National Festival Committees Letter by the International Preparatory Committee of the 7th World Youth and Students' Festival - Rubin Marcel; Rubin Marcel; Garcias Jean; Garcias Jean; Ardaly Daouda; Ardaly Daouda; Παγκόσμιο Φεστιβάλ Νεολαίας και Σπουδαστών (7ο, Βιέννη, 7-8/1959) / Διεθνής Προπαρασκευαστική Επιτροπή; World Youth Festival (Vienna 1959) - International Organisational Committee