Netherlands) International Congress on the Care of the Deaf-mute (1950 Groningen

• International Congres voor Doffstommenzorg = International Congress on the Care of the Deaf-mute = Cong©·s International concernant les sourds-muets = Internationaler Kongress f©ơr Taubstummenf©ơr sorge, Groningen, 5-10 Juni 1950